单项选择题
A.弹性圆柱销 B.偏心螺栓 C.注油嘴 D.锥形垫片
A.50V~121V B.77V~121V C.50V~115V D.77V~115V
A.冷凝风机故障CMF B.电加热器故障FHF C.低压保护故障PLV D.高压保护故障PHV
A.1650A B.1660A C.1670A D.1680A
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