题目内容
（请给出正确答案）
A.10 meters
B.20 meters
C.50 meters
D.100 meters
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更多“When navigating using DGPS（Dif…”相关的问题
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
A.Horizontal Dilution of Precision
B.Selective Availability
C.Doppler Shifting
D.Precision Coding
A、A．station the lookout in the wheelhouse to keep a continuous watch on the radar
B、B．secure the sounding of fog signals until a vessel closes within five miles
C、C．station a lookout as low down and far forward as possible
D、D．keep the radar on the shortest available range for early detection of approaching vessels
A.a straight line drawn on the chart approximates a great circle
B.the chart should not be used outside of the standard parallels
C.the course angle is measured at the mid-longitude of the track line
D.distance cannot be measured directly from the chart
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
It is not recommended that any person shall be allowed on the bridge or in the pilot house except the pilot and other representative of the Canal，and Master and such officers and other members of the crew of the vessel as may be necessary for its navigation and control，management，operation and safety．
Navigational aids are difficult to maintain and are reported to be unreliable in this waters．A considerable amount of shipping uses the canal and，in addition，many local fishing craft with nets may be encountered in the area.Since passage through the canal entails a run of more than 250 miles，long periods of considerable vigilance are necessary in order to maintain safe standards of navigation．
问题：PILOT HOUSE is referred to ______ in this passage．
A.the cabin in which the pilot stays
B.the space in which the rudder is located
C.the bridge of vessels
D.the cabin which is prepared for the pilot
SHIPPING is referred to ______ in this passage．A.he operations of transportation of goods by sea
B.the procedures of marine transportation business
C.the management of marine transportation business
D.the vessels and ships
The author implies that ______ ．A.even by making use of modern instrument it is difficult to maintain safety in this area
B.mariners should take it easy when navigating in this area
C.modern instrument should be used to control the safety of navigation in this area
D.it is dangerous when navigating in this area
The person on the bridge or in the pilot house shall be those ______ ．A.who are recommended
B.who are familiar with the navigation，management，operation and safety control
C.who are directly involved in the navigation，management，operation and safety control
D.who have nothing to do with the navigation，management，operation and safety control
正弦交流电压的数学表达式为u
A.uρ=ucosψ+vsinψ，uψ=-usinψ+vcosψ
B.uρ=ucosψ-vsinψ，uψ=usinψ+vcosψ
C.u=uρcosψ+uψsinψ，v=uρsinψ+uψcosψ
D.u=uρcosψ+uψsinψ，v=uρsinψ-uψcosψ
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![纯电容电路中，设u=UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。](http://static.jiandati.com/b7c0da1-chaoxing2016-486465.png)
UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。
![纯电容电路中，设u=UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。](http://static.jiandati.com/d0999f8-chaoxing2016-486474.png)
![纯电容电路中，设u=UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。](http://static.jiandati.com/d411043-chaoxing2016-486475.png)
![纯电容电路中，设u=UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。](http://static.jiandati.com/ef3c227-chaoxing2016-486476.png)
![纯电容电路中，设u=UsinωtV，u、i为关联参考方向，则关于电流正确的相量表示法为 [ ]A。](http://static.jiandati.com/f9c7dce-chaoxing2016-486477.png)
；(2)
；(3)
