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简述作物抗寒性生理机制。

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吊顶时对石膏板有何要求?

()是完整健康概念的重要组成部分。

A. 生理健康
B. 心理健康
C. 心理沟通

人与自然和谐发展是科学发展观的题中应有之义

A. 正确
B. 错误

Which statement concerning maneuvering in restricted visibility is FALSE?().

A vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steerageway
B. A vessel which hears a fog signal forward of her beam shall stop her engines
C. A vessel which hears a fog signal forward of the beam shall navigate with caution
D. If a vessel determines by radar that a close-quarters situation is developing,she shall take avoiding action in ample time

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