Diesel engine cylinder head test cocks are used to （）<br>A:check cylinder lubrication<br>B:connect the pressure indicator pressure<br>C:test cylinder heads<br>D:connect the exhaust gas pyrometers

Diesel engine cylinder head test cocks are used to （）
A:check cylinder lubrication
B:connect the pressure indicator pressure
C:test cylinder heads
D:connect the exhaust gas pyrometers

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