A A. type of cargo gear B B. instrument used in celestial navigation C C. instrument used to measure relative humidity D 点我阅读全文
A A. red line B B. Purple line C C. blue line D D. dashed blue line 答案 B. Purple line A psychrometer has two thermomete 点我阅读全文
A A. cyclone B B. anticyclone C C. cold front D D. occluded front 答案 A. cyclone The legend/symbol which designates an o 点我阅读全文
A A. anticyclone B B. cold front C C. occluded front D D. cyclone 答案 A. anticyclone A generally circular low pressure a 点我阅读全文
The common way to obtain your ship’s position is __. A A.keeping a close watch and lookout B B.taking a radar range and 点我阅读全文
The radio waves used for radar are very short，only______long． A A.a few centimeters B B.a few fathoms C C.a few meters D 点我阅读全文
When hitting a solid object such as a ship or an airplane, the radar waves are reflected back______ they came. A A.in th 点我阅读全文
When using a radar in a unstabilized mode, fixes are determined most easily from __. A A.center bearings B B.tangent bea 点我阅读全文
A A. lapse rate B B. isobar C C. front D D. continent 答案 C. front A cloud of marked vertical development (often anvil-s 点我阅读全文
A A. cirrus B B. cirrocumulus C C. altocumulus D D. Cumulonimbus 答案 D. Cumulonimbus A cyclone in its final stage of dev 点我阅读全文
A A. tornado B B. anticyclone C C. occluded cyclone or occluded front D D. polar cyclone 答案 C. occluded cyclone or occl 点我阅读全文
A A. warm front B B. occluded front C C. medium front D D. cold front 答案 A. warm front Pressure gradient is a measure o 点我阅读全文
A A. a high-pressure area B B. pressure difference over horizontal distance C C. pressure difference over time D D. vert 点我阅读全文
The ARPA may swap targets when automatically tracking if two targets __ A A.are tracked on reciprocal bearings B B.are t 点我阅读全文
The correct method of switching off a marine radar is to turn power switch to position first, then to __ position. 点我阅读全文
A A.off / standby B B.standby / off C C.standby / close D D.close / standby 答案 B.standby / off The abbreviation PPI in 点我阅读全文
A A.plan position indicator B B.plain position indicator C C.plane position indication D D.policy proof of interest 答案 点我阅读全文
Many of the soundings shown on the chart are derived from __ , Undue reliance should not be placed upon them.A A. comple 点我阅读全文
The datum from which the predicted heights of tides are reckoned in the tide table is _.A A. mean low water B B. the sam 点我阅读全文
All of the following information concerning lighted aids to navigation may be read directly from the light list except t 点我阅读全文
Which is a weekly publication advising mariners of important matters affecting navigational Safety ?A A. Light List B B. 点我阅读全文
Data relating to the direction and velocity of rotary tidal currents can be found in the __A A. Mariners Guide B B. Tida 点我阅读全文