A mooring buoy，if lighted，shows which color light?（）
A. Yellow
B. White
C. Blue
D. Any color except red or gree
In bad weather，what length of chain should be used with a single anchor? （）
A. 3 times the depth of water
B. 6 times the depth of water
C. 10 times the depth of water
D. 15 times the depth of water
速度分量、位移增量、应变增量和应变速率增量是如何定义的？
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