Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?（）

单项选择题The standards of physical and medical fitness established by the Party shall not ensure that seafarers（）.

A.have the physical capability to fulfill all the requirements of the basic training
B.demonstrate adequate hearing and speech to communicate effectively
C.are suffering from any medical conditions likely to be aggravated by service at sea
D.have no medical condition that will prevent the effective e and safe conduct of their routine and emergency duties on board

单项选择题The maneuverability of the ship is considered（）if the following criteria are complied with.

A.satisfactory
B.satisfactorily
C.smooth
D.smoothly

单项选择题What does ECDIS stand for?（）

A.Electrical Chart Display and Indication System
B.Electronic Chart Display and Information system
C.Electric Chart Display and Information System
D.Electronic Chart Display and Indicating system

单项选择题Bags are usually stowed in between the bulk grain（）.

A.to ventilate the hold
B.to separate the cargo
C.to replace shifting boards
D.to facilitate stowage

单项选择题When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision,they shall be deemed to be in（）.

A.head-on situation
B.crossing situation
C.overtaking situation
D.close-quarters situation