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高频阻波器有哪些故障，应立即申请停运？

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Which statement is true concerning a vessel equipped with operational radar?（）.

A. The Master of the vessel must be on the bridge when the radar is in use
B. The radar equipment is only required to be used in restricted visibility
C. The use of a radar excuses a vessel from the need of a look-out
D. This equipment must be used to obtain early warning of risk of collisio

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高频阻波器有哪些故障，应立即申请停运？

Which statement is true concerning a vessel equipped with operational radar?（）.

机关行政事务管理的指导原则包括（）；主动原则；勤俭廉洁原则；科学管理原则.

黄瓜根系对地温反应很敏感，低温期定植黄瓜时10cm的地温最低要求达到（）以上。

简述灌入式填缝的施工应符合哪些规定。