When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）

A、overloading the engine

B、low exhaust valve lift

C、excessive cylinder cooling

D、insufficient mechanical clearance

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第1题

[判断题] Normally when we read our eyes flick backwards and forwards over the text.（）

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第2题

[] When the forwarder takes delivery of the goods and issues relevant documents such as a houses bill of lading to the consignor， it normally means that he takes the position as the carrier.

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第3题

[判断题] When the forwarder takes delivery of the goods and issues relevant documents such as a houses bill of lading to the consignor， it normally means that he takes the position as the carrier.

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第4题

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第5题

[单选题] The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is（）.

A、caused by retarded injection timing B、caused by a mechanical defect in one cylinder C、caused by high fuel injection pressures D、normal for these conditions

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第6题

[单选题] When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）

A、maintain higher than normal jacket water temperature B、change the lube oil more frequently than normal C、maintain a higher air-box temperature than normal D、maintain a higher air-box pressure than normal

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第7题