更多"At a rough estimate,Nigeria is（）Gre"的相关试题:
[单项选择]You are running parallel to the coast and estimate that the current is against you.In plotting a running fix using bearings from the same object on the coast，the greatest safety margin from inshore dangers will result if what speed is used to determine（）.
A. Minimum speed estimate
B. Maximum speed estimate
C. Average speed estimate
D. A running fix should not be used under these conditions
[单项选择]How can you estimate the position of a tropical storm’s center?（）
A. With a radio weather bulletin or weather fax
B. using shipboard radar
C. observe the wind direction and apply Buys Ballot's law
D. All of the above
[单项选择]Never make comment, estimate or guess in your logbook, but（）only.
A. the specifications
B. the facts
C. the descriptions
D. the details
[单项选择]Never make comment，estimate or guess in your Logbook，but（）only.
A. the specifications
B. the facts
C. the descriptions
D. the details
[单项选择]The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
A. cloud movement
B. vessel heading
C. waves
D. swells
[单项选择]When anchoring a small sailing vessel in rough weather，the best anchor line would be composed of（）.
A. chain-wire
B. chain-manila
C. chain-nylon
D. all chain
[单项选择]Conditions for crossing a rough bar are usually best at （）.
A. low water slack
B. high water slack
C. high water ebb
D. high water flood
[单项选择]The Beaufort scale is used to estimate the（）.
A. Wind direction
B. Percentage of cloud cover
C. Wind speed
D. Barometric pressure
[单项选择]When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）
A. cleaning fuel oil, lubricating oil and seawater filter
B. reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propeller
C. using low sea chest
D. closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments
[单项选择]When ship navigating in rough sea, the correct operation is （）
A. navigating with a low diesel engine speed
B. navigating with a stable diesel engine speed
C. increasing the efficiency of propeller
D. increasing fuel injection
[单项选择]When launching a lifeboat in the rough sea, the davit gears should be released（）.
A. before the boat is lowered from the stowed position
B. as the boat fall blocks break clear of the davit head
C. before the boat is lowered from the embarkation level
D. after the boat is released into the water
[单项选择]When launching a lifeboat in the rough sea，the davit gears should be released（）.
A. before the boat is lowered from the stowed position
B. as the boat fall blocks break clear of the davit head
C. before the boat is lowered from the embarkation level
D. after the boat is released into the water
[单项选择]（）should generally be used when handing rough or sharp objects.
A. Heat-resistant
B. Rubber gloves
C. PVC gloves
D. Leather gloves
[单项选择]When weighing anchor in a rough sea，how would you avoid risk of damaging the bow plating （）.
A. Heave it home as fast as you can
B. Heave it home intermittently，between swells
C. Leave the anchor under foot，until the vessel may be brought before the Sea
D. Wait for a calm spot between seas，then house it
[单项选择]If your propeller is racing in rough weather，you should（）.
A. decrease your engine speed
B. ignore it
C. increase your engine speed
D. stop your engine until the rough weather passes
[单项选择]（）causing strong winds and rough sea north west Bay of Biscay.
A. Strong low pressure
B. Strong high pressure
C. Steep pressure gradient
D. Steep gradient pressure
[单项选择]Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
A. can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
B. are indistinguishable from sea return on the PPI
C. are invisible to radar when covered with a thick layer of snow
D. are usually seen at night before they are close enough to provide a radar echo
[单项选择]Before the seas get rough, it is a good safety practice to （）.
A. secure loose gear
B. move quickly about the ship
C. increase lighting
D. shutdown auxiliary equipment
