单项选择题
Assumption shall（）on the basis of scanty information especially scanty radar information.
A.make B.be made C.not make D.not be made
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（）.
单项选择题 A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.
