在低循环倍率锅炉中，当锅炉负荷变化时，水冷壁管工质流量变化很大。
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How is “radio silence” imposed?（）
A. By the On Scene Coordinator (OSC)
By the Coast Earth Station (CES) controlling the distress communications on that frequency
C. It is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channel
D. It is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel
散打战术训练先应树立正确的（）、要遵循（）和（），注意（）和（）。
循环倍率是指该循环回路所产生的蒸汽流量。
A. 正确
B. 错误
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