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理论联系实际原则

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Fire protection and manning regulations for towing vessels state that the Master or person in charge must ensure that all crew members who have not participated in the drills or received the safety orientation（）.

A. receive a safety orientation or view a videotape before the vessel gets underway
B. view a videotape on safety procedures within 48 hours of reporting for duty
C. receive a safety orientation within 24 hours of reporting for duty
D. none of the above

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食品酿造生产中，选择菌种应遵循什么原则？

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低温阀门指使用场合介质温度高于（）CC的阀门。

A. -40~-100
B. -50~-100
C. -50~-150
D. -40~-150

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（）负责调节液力变矩器油路压力和润滑压力。

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