Risk of collision may be deemed to exist（）.
A . if the compass bearing of an approaching vessel does not appreciably change
B . even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C . if you observe both sidelights of a vessel ahead for an extended period of time
D . All of the above
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A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
A . remains fully obliged
B . has no obligation
C . is not necessarily
D . is exempted
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Which procedure(s) shall be used to determine risk of collision? （）
A . Watching the compass bearing of an approaching vessel
B . Systematic observation of objects detected by radar
C . Long-range radar scanning
D . All of the above
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When two power-driven vessels are meeting head-on and there is a risk of collision,each shall（）.
A . stop her engines
B . alter course to starboard
C . sound the danger signal
D . back dow
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A vessel constrained by her draught shall，when risk of collision with another vessel in a crossing or head-on situation exists，（）.
A . apply the relevant Steering and Sailing Rules as a power-driven vessel
B . apply the relevant Steering and Sailing Rules as a Sailing vessel
C . apply the relevant Steering and Sailing Rules as a vessel not under command
D . apply the relevant Steering and Sailing Rules as a vessel engaged in a towing operatio
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You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）
A . Your speed must be reduced to bare steerage ways
B . A look-out is not required if the radar is on
C . The radar should always be kept on a short-range scale
D . Fog signals are only required when a vessel is detected by radar
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When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision，they shall be deemed to be in（）.
A . crossing situation
B . head-on situation
C . restricted visibility
D . overtaking situatio
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Which one of the following rules is not regarding two power-driven vessels meeting end or nearly end on so as to involve risk of collision（）.
A . Each shall keep her course and speed
B . Each shall alter her course to starboard
C . Each shall pass on the portside to the other
D . Each shall indicate such action by one short blast on the whistle
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A vessel hearing a fog signal forward of her beam has not determined if risk of collision exists. She shall reduce speed to（）.
A . moderate speed
B . safe speed
C . half speed
D . bare steerageway
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When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision,they shall be deemed to be in（）.
A . head-on situation
B . crossing situation
C . overtaking situation
D . close-quarters situatio
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（）, where extensive work, particularly to the ship’s structure may be repairedThese are the result of groundings collisions and other accidents.
A . voyage repairs
B . routine docking
C . damage repairs
D . conversio
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Risk of collision exists when an approaching vessel has a(n)（）.
A、generally steady bearing and decreasing range
B、generally steady range and increasing bearing
C、 increasing range and bearing
D、decreasing bearing only
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In determining if risk of collision exists the following considerations shall be among（）.
A . these taken into calculation
B . those taking into account
C . that taken into account
D . those taken into account
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The risk of collision shall be deemed to exist if the compass bearing of an approaching vessel （）.
A、did not appreciably change
B、does not appreciably change
C、do not appreciably change
D、not appreciably change
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You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.
A . Reduce speed to bare steerageway
B . Stop your engines
C . Begin a radar plot
D . All of the above
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When you doubt the existence of risk of collision,（）.
A . such risk shall be deemed to exist
B . Such risk shall not be deemed to exist
C . You should keep your course and speed
D . You needn‟t take any action to avoid collision with any vessel
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In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should（）.
A . stop your engines
B . sound the danger signal at two-minute intervals
C . hold course and speed until the other vessel is sighted
D . take avoiding action as soon as possible
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If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.
A . At any time you feel it is appropriate
B . Only when you have reached extremis
C . When you determine that your present course will cross ahead of the other vessel
D . When it becomes apparent to you that the give-way vessel is not taking appropriate actio
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To determine if risk of collision exists，a vessel which is fitted with radar must use（）.
A . radar scanning
B . radar plotting
C . compass bearings
D . All of the above
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Risk of collision may exist ______.
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Smoking may also the risk of eye, kidney and nerve problems.
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79. When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision, they shall be deemed to be in _____.
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164. When you doubt the existence of risk of collision ______
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Which of the following may increase the risk of SIDS, according to Parisis steps？
A．Make babies sleep on the back.
B．Cover babies with more blankets.
C．Keep the air in bedrooms ventilated.
D．Keep the temperature in bedrooms cool.
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Scientists now believe that artificial-hip implants, previously thought to be safe, may actually increase the risk of cancer in recipients after about 45 years of use. Though these implants do improve the quality of recipients lives, the increased risk of cancer is an unacceptable price to pay for these improvements. Therefore, they should be banned. Which of the following, if true, is the strongest counterargument to the argument above？
A．Artificial-hip implant surgery can cause severe complications, such as infection, chronic fever, and bone degeneration, and these complications can themselves be crippling or even fatal.
B．Almost all artificial-hip implant recipients receive their implants at an age when they are unlikely to live more than an additional 30 years.
C．Although artificial-hip implants increase the risk of cancer after about 45 years of use, a few of the cancers they induce are not fatal.
D．Since artificial-hip implants are not very common, banning them would cause little hardship.
E．Although the benefits of artificial-hip implant surgery have remained substantially the same over the past decade, the price of the surgery has risen considerably.
