A.Wave lengthB.Wave heightC.Wave breadthD.wave depthWha……

单项选择题Depths in the routes (Malacca and Singapore Straits) vary between 20m and about 23m but there are many areas of sand waves and depths are liable to change. The statement infers that（）.

A.depths in Malacca and Singapore Straits are stable
B.depths in Malacca and Singapore Straits are changeable
C.depths in Malacca and Singapore Straits are invariable
D.depths in Malacca and Singapore Straits are the same all the time

单项选择题The lifeboat is constructed of（）

A.totally enclosed
B.glass-reinforced plastic
C.self-righting
D.powered

单项选择题Deep-draught vessels and VLCCs shall allow for（）of at least 3.5 m at all times during the entire passage through the Straits of Malacca and Singapore.

A.a draft
B.a freeboard
C.an air draft
D.an under-keel clearance

单项选择题Vessel must be（）duly qualified officers and crew.

A.supplied with
B.equipped with
C.manned with
D.fitted with

单项选择题You are in charge of a power-driven vessel navigating at night.You sight the red sidelight of another vessel on your port bow.The other vessel’s aft masthead light is to the right of her forward masthead light. You should（）.

A.stop engines
B.hold course and speed
C.alter course to port
D.sound the danger signal