【名词&注释】
平均速度(average velocity)
[单选题]船舶申请公证检验，验船师对申请检验的项目______。Ⅰ、进行检验并作出鉴定Ⅱ、提供处理有关业务的依据Ⅲ、进行船级检验
A. Ⅰ+Ⅲ
B. Ⅱ+Ⅲ
C. Ⅰ+Ⅱ
D. Ⅰ+Ⅱ+Ⅲ
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举一反三：
[单选题]If the head pressure of a reciprocating refrigeration compressor is excessive
A. the relief valve should open before the high pressure cutout
B. the relief valve should open and allow the excess refrigerant to flow to the receiver
C. the high pressure cutout switch should operate before the relief valve opens
D. you should close the discharging valve
[单选题]锚机将单锚从三节锚链收至一节锚链的平均速度应不小于()m/min。
A. 7
B. 8
C. 9
D. 10
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