单项选择题
A stream of water immediately surrounding a moving vessel’s hull,flowing in the same direction as the vessel is known as().
A.directional current
B.forward current
C.propeller current
D.wake current
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欧阳修是()词人。
A.豪放派
B.边塞派
C.田园派
D.婉约派 -
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Leaking oil seals on a diesel engine turbocharger can cause()
A.the engine to run after the fuel has been secured
B.the engine to over-speed
C.a fire
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判断题
浓度越高,药物的作用越强,故用95%的乙醇消毒,效果更好。
