High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.
A . many thousand times larger than
B . the same as
C . many thousand times smaller
D . none of the above
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The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
A . metering
B . timing
C . rate of injection
D . rate of distributio
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While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
A . crankcase
B . slipper
C . cam housing
D . crankshaft
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What is the direction of rotation of tropical cyclones,tropical storms and hurricanes in the Northern Hemisphere?（）
A . Clockwise and outward
B . Counterclockwise and inward
C . Counterclockwise and outward
D . Clockwise and inward
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The coil of wire rotating in the magnetic field produces the（）.
A . voltage
B . current
C . power
D . frequency
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To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.
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B . bearings
C . easing volutes
D . wearing ring
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In the Southern Hemisphere winds in a low pressure system rotate in a（）.
A . clockwise direction
B . northeasterly direction
C . northerly direction
D . counterclockwise directio
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The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.
A . Pressure gradient
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C . Aurora borealis
D . Ballistic deflectio
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In order to change the direction of rotation of a D-Cmotor （） (1) the field leads must be changed (2) the input leads must be changed
A . （1）only
B . （2）only
C . either（1）or（2）
D . neither（1）or（2）
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In a four-stroke engines the camshaft rotates at （）.
A . half the engine rotational speed
B . twice the engine rotational speed
C . the engine rotational speed
D . four times the engine rotational speed
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Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）
A . Splash lubrication
B . Pressure lubrication
C . Sight feed lubricators
D . Mechanical lubricator
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In a four-stroke/cycle diesel engine, the camshaft rotates at （）
A . twice the crankshaft speed
B . half the crankshaft speed
C . the same speed as that of the crankshaft
D . a speed independent of that of the crankshaft
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在After Effects 6.5中，给当前图层的Rotation属性添加一个关键帧的热键是：（C）
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Some cranes are mounted in pairs on a common platform which can be rotated through（）.
A . 360°
B . 270°
C . 180°
D . 90°
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A gudgeon pin in a trunk piston may be free to float and rotate, with （） to limit axial movement.
A . split pins
B . crankpins
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What is a rotating item?（）
A . A rotating item is an individual item that is defined with a common item number. An item is designated as rotating because one wants to be able to create individual asset records by using the information (Classification, Specification,and Item Assembly Structure) contained on the item record.
B . A rotating item is a set of items that are defined with a specific code. An item is designated as rotating because one does not want to be able to create individual asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the item record.
C . A rotating item is a set of kits that are defined with a specific description and GL. An item is designated as rotating because one has the single cost to manage prefers to be able to create individual asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the assembly record.
D . A rotating item is an individual item that is defined with a common item number and can be a spare part. An item is designated as rotating because one wants to be able to create multiple asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the item set records.
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Anchor（） are used in some installations where the cable lifter rotates about a vertical axis.
A . windlasses
B . drums
C . capstans
D . warp end
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A class "C" fire would occur in （）
A . bedding
B . pipe insulation
C . paint
D . a generator
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The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）
A . No fuel will be delivered
B . The maximum effective stroke will be attained
C . The fuel delivered to the cylinder will be excessive
D . The injection nozzle will overheat and carbonize
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Anchor capstans are used in some installation where the cable lifter rotates about a （）.
A . horizontal axis
B . crankshaft
C . vertical axis
D . camshaft
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The （） will have a rotating honorary chairman.
A . Board of Directors
B . Boards of Director
C . boards of director
D . Board Director
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High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.
A . many thousand times
B . between times
C . one time
D . at time
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The insulin injection sites must be rotated in order to prevent erosion of the fat beneath the skin.
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The high-speed trains can have a major impact on travel preferences.
A．influence
B．force
C．surprise
D．power
