The notice of casualty to a ship must include().
A. a request for assistance
B. the location of the unit at the time of the casualty
C. an estimate of the cost to repair damages
D. the amount of fuel remaining
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Second, the car needs()collisions.
A. to be able to avoid
B. being able to avoid
C. to be able to avoiding
夹套式换热器最简单的板面式换热器。
A. 正确
B. 错误