根据中华人民共和国船舶污染物排放标准，目前船舶含油污水排放，距最近陆地12海里以外，应不大于（）。
A. 100mg/L
B. 50mg/L
C. 15mg/L
D. 5mg/L
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叶背上切面最大厚度处所产生的空泡为（）.
A. 涡空泡
B. 泡状空泡
C. 片状空泡
D. 云雾状空泡
The purpose of the low pressure cut-out switch is to （）.
A. maintain liquid refrigerant at the suction of the compressor
B. maintain a preset suction pressure to the compressor
C. start and stop the compressor at preset operating pressures
D. operate at minimum efficiency
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