海船船员 2021_08_26 每日一练
You are on international waters during a heavy rainstorm and hear a vessel sounding a fog signal of one prolonged blast followed by two short blasts. Which of the following could it be?Ⅰ.A vessel laying submarine cable making way.Ⅱ.A pilot vessel on station at anchor.
A.Ⅰ only
B.Ⅱ only
C.Either Ⅰ or Ⅱ
D.Neither Ⅰ nor Ⅱ
船舶对海洋造成油污染的特点中,不正确的是________。①污染持续时间长②扩散范围广③污染物种类繁多,成分复杂④对人类危害不大⑤无法彻底防止。
A.②+③+④
B.②+④+⑤
C.③+④+⑤
D.①+③+⑤