单项选择题
At sea，we can use（）to fix the ship’s position.
A.VHF B.Steering Gear C.Rudder Indicator D.Loran
单项选择题 Assumption shall（）on the basis of scanty information especially scanty radar information.
单项选择题 As a vessel changes course to starboard，the compass card in a magnetic compass（）.
单项选择题 A system of reservoirs and connecting tubes in a gyro compass is called a（）.
