单项选择题

I certify that the（）of the portable radio apparatus for survival craft，if provided，complies with the said regulations.

A.infection
B.functioning
C.effecting
D.affection

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单项选择题

A.take
B.bring
C.carry
D.get

单项选择题

A.is not visible
B.are not invisible
C.are not visible
D.can easily be seen

单项选择题

A.My vessel is leaking
B.My vessel is producing fresh water
C.My vessel is producing sea water
D.Sea water is de-salted on board my vessel