单项选择题

Environmental loading consists of the forces caused by wind，waves，and（）.

A.drilling
B.soil reactions
C.temperature
D.current

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单项选择题

Entering from seaward，triangular-shaped daymarks are used to mark（）.

A.the starboard side of the channel
B.the centerline of the channel
C.an obstruction where the preferred channel is to starboard
D.special purpose areas

单项选择题

During the day，a vessel with a tow over 200 meters in length will show（）.

A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward

单项选择题

Daymarks marking the starboard side of the channel when going towards the sea are（）.

A.green squares
B.green triangles
C.red squares
D.red triangles