The engine has one or two group of fuel pumps, depending upon （）.
A . the number of fuel valves
B . the number of cylinders
C . the speed of engine
D . the power of engine
相似题目
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On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.
A、as soon as possible
B、prior to its publication
C、in advance of any possible accident
D、by means of other than airmails
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A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.
A . can’t be controlled very precisely
B . can’t be controlled as flexibly as the separate pump system
C . can be controlled as flexibly as the separate pump system
D . can be controlled more precisely and flexibly
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（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.
A . A common rail engine；conventional engines
B . A conventional engine；common rail engines
C . A marine diesel engine；most other engines
D . A two-stroke engine；four-stroke engine
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One of the differences between a two-stroke engine and a four-stroke engine is,（）
A . a two-stroke engine can’t work without cylinders
B . a two-stroke engine can’t work without pistons
C . a two-stroke engine can’t work without crankshafts
D . a two-stroke engine can’t work without a blower
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The fact that it has become more onerous or more expensive for one party than he thought （）sufficient to bring about a frustration.
A . is not
B . is
C . will probably be
D . is one of the way by which it i
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In the emergency alarm signals, if the alarm or whistle two long sounds followed by one short sound for 1 minute, it is the （） emergency.
A . fire fighting
B . leakage blocking
C . abandon ship
D . integratio
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（）is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about（）
A . Inefficient scavenging；twice
B . Inefficient scavenging；1~8 times
C . Fewer strokes in a circle；twice
D . Fewer strokes in a circle；1~8 time
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A c（） sentence contains two or more clauses， one of which is incorporated in the other.
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A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.
A . flame stopper
B . flame screen
C . flame filter
D . flame restrictor
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In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.
A . greater
B . better
C . smaller
D . le
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Which one of two crossing power-driven vessels has the right of way in a fog（）.
A、 Both vessels
B、 Neither vessel
C、The vessel on portside
D、 The vessel on starboard side
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User Scott has updated the salary of one of the employees in the EMPLOYEES table and has not committed the transaction. What are the two types of locks that this scenario would lead to？（）
A . null lock on the row being updated
B . null lock on the table containing the row
C . ROW SHARE lock for the row being updated
D . ROW EXCLUSIVE lock for the row being updated
E . shared row-exclusive lock for the row being updated
F . a shareable table lock for the table containing the row
G . exclusive table-level lock for the table containing the row
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A theme park is the one that has a certain idea or a certain theme.
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Short essay usually has one or two introductory paragraphs. ( )
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When a pronoun has more than one possible antecedent in a sentence, the reader will get confused about which antecedent is meant. It is called “a pronoun with two or more possible antecedents”.
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Whether a ship is sailing before the wind or sailing in the rough sea, we must reduce the fuel injection of the main engineFor the former one, it aims to prevent the main engine being , while for the later one, it aims to prevent the main engine being .
A.overspeed / overload
B.overload / overspeed
C.over torque / overspeed
D.low mechanical efficiency / overload
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One of the reasons why business or government has not taken tough measures to stop hacking is that
A．it will cause fear among the public.
B．hacking has not caused much damage.
C．tough measures are illegal.
D．communication may be interrupted.
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There are one or two minor differences, but they are ________ the same text.
A substantially
B exceedingly
C remarkably
D separately
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Mike wants the apartment for only one or two ___.A．months
B．years
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It has been said that the Acts provided a new course of action and did not merely requlate or enlarge an old one.
A．manage
B．control
C．revise
D．outset
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Passage Two：Questions 16 to 20 are based on the following passage.Sport is not only physically challenging, but it can also be mentally challenging. Criticism from coaches, parents, and other teammates, as well as pressure to win can create an excessive amount of anxiety or stress for young athletes (运动员). Stress can be physical, emotional, or psychological, and research has indicated that it can lead to burnout. Burnout has been described as dropping or quitting of an activity that was at one time enjoyable.
The early years of development are critical years for learning abut oneself. The sport setting is one where valuable experiences can take place. Young athletes can, for example, learn how to cooperate with others, make friends, and gain other social skills that will be used throughout their lives. Coaches and parents should be aware, at all times, that their feedback to youngsters can greatly affect their children. Youngsters may take their parents’ and coaches’ criticisms to heart and find a flaw (缺陷) in themselves.
Coaches and parents should also be cautious that youth sport participation does not become work for children. The outcome of the game should not be more important than the process of learning the sport and other life lessons. In today’s youth sport setting, young athletes may be worrying more about who will win instead of enjoying themselves and the sport. Following a game, many parents and coaches focus on the outcome and find fault with youngsters’ performances. Positive reinforcement should be provided regardless of the outcome. Research indicates that positive reinforcement motivates and has a greater effect on learning than criticism. Again, criticism can create high levels of stress, which can lead to burnout.
第16题：An effective way to prevent the burnout of young athletes is ________.
A) to make sports less competitive
B) to make sports more challenging
C) to reduce their mental stress
D) to increase their sense of success
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When students are doing a group-work task, the teacher joins one or two groups for a short period of time.
A．controller
B．prompter
C．organizer
D．participant
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Diphthongs has two different kinds, one is centering diphtongs, the other is closing diphthongs.
