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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相关考题
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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
