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危机是隐患存在的前提条件，而隐患又是事故发生的必要条件。()

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When the height of the metacenter has the same value as the height of the center of gravity，the metacentric height is equal to ().

A. The height of the metacenter
B. The height of the center of gravity
C. The same as half the height of the metacenter
D. Zero

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高智力并不能保证有高创造力，而智商不高肯定有碍于创造力的提高。()

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依靠生物节律理论，完全避免事故是可能的。()

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Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines

A. Oil vapour in air piping are dangerous
B. Explosion will cause oil vapouring in air lines
C. Oil vapour in air piping should be drained
D. Oil in air piping should not be drained

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