单项选择题

In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the _____.
A.compressor
B.condenser
C.throttle valve
D.evaporator

A.
A.compressor
B.condenser
C.throttle
B.evaporator

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单项选择题

In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt.”, the 'piston ring belt' means _____.
A.piston crown
B.piston ring groove
C.piston skirt
D.piston ring area

A.”,
B.
A.piston
C.piston
D.piston
E.piston

单项选择题

根据饭店的档次,规模定员,按全员量定工种和岗位的人数,客房部人数约占饭店总人数的30%,设楼层服务台的饭店楼层服务员人数与客房数的比例为()左右。
A.1:51:6
B.1:21:3
C.1:41:5
D.1:31:4

A.1:51:6
B.1:21:3
C.1:41:5
D.1:31:4