单项选择题
The correct method of switching off a marine radar is to turn power switch to（）position first，then to（）position.
A.off／standby B.standby／off C.standby／close D.close／standby
单项选择题 The common way to obtain your ship’s position is（）.
单项选择题 The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.
单项选择题 The articulated light is superior to other types of buoys because（）.
