皮皮学，免费搜题
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搜题
【判断题】
打孔机使用一段时间后，视磨损情况需对钻头和扩孔针进行更换。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】_____ supplies pilot air to control the cylinder air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】supplies pilot air to the control cylinders of the cylinder air start valves.
A.
An air compressor
B.
An indicator cock
C.
An air distributor
D.
A safety valve
【单选题】_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A.
An air receiver
B.
An operating valve
C.
An automatic valve
D.
An air distributor
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