单项选择题
A bridge over a navigable waterway is being repaired. There is a traveller platform under the bridge’s deck that significantly reduces the vertical clearance. If required by the CG district commander，how will this be indicated at night?（）
A.Illumination by flood lights
B.A quick flashing red light at each lower corner
C.A strobe light visible both up and downstream
D.Fixed amber lights under the extreme outer edges of the traveller
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相关考题
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单项选择题
（）of the following items is not in the charge of Chief Officer in repairing operation.
A.hull cleaning
B.derusting and painting
C.the maintenance of boiler
D.docking and undocking -
单项选择题
（）about 20 sq.m to be sand-blasted.
A.The rusting area
B.The rusted area
C.The corroded area
D.The corrosive area -
单项选择题
Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A.install shoring so the shoring supports the damaged bulkheads without pushing on them
B.install shoring so that it pushes on the damaged bulkhead while supporting it
C.use jacks or chain falls to remove the set before installing shores
D.place sandbags by the bulkhead without installing shores
