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。()
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
《中华人民共和国动物防疫法》的立法目的是()
A. 加强对动物防疫活动的管理
B. 预防、控制和扑灭动物疫病
C. 促进养殖业发展，保护人体健康
D. 维护公共卫生
E. 以上都是
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