When you doubt the existence of risk of collision,（）.
A. such risk shall be deemed to exist
B. Such risk shall not be deemed to exist
C. You should keep your course and speed
D. You needn‟t take any action to avoid collision with any vessel
关于冷高分压力表失灵的现象，下列说法不正确的是（）。
A. 压力表指针无变化
B. 压力表指示与变送器指示不一致
C. 压力表指示与变送器指示差别大且冷高分与循环氢分液罐压力变送器指示相近
D. 压力表指示与变送器指示差别大且冷高分与循环氢分液罐压力变送器指示差别大
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