单项选择题
A.the radio apparatus fitted on the portside B.the radio with a portable equipment C.the radio equipment which is easily movable D.the portable radio with some apparatus
The most common type of davit found on merchant vessels...
单项选择题The most common type of davit found on merchant vessels today is the（）.
A.radial B.sheath-screw C.gravity D.quadrantal
The holding capability of an anchor is primarily determ...
单项选择题The holding capability of an anchor is primarily determined by the（）.
A.shape of the anchor B.stowage of the anchor on board C.anchor's ability to dig in D.size of the vessel and its draft
The function of the bypass valve on the self-contained ...
单项选择题The function of the bypass valve on the self-contained breathing apparatus is to（）.
A.control the pressure of the oxygen as it enters the body B.allow the wearer to manually give himself oxygen C.release excess heat which would otherwise cause the bottle to explode D.allow exhaled gases to pass outside the bottle
