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单选题
The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
A
lathed
B
shaped
C
shrunk
D
developed
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考题
单选题In a four-stroke engine the camshaft rotates at （）.A
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单选题The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.A
lathedB
shapedC
shrunkD
developed
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has little or no internal frictionB
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(1) onlyB
(2) onlyC
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考题
单选题In a four-stroke engines the camshaft rotates at （）.A
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单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）A
twice the crankshaft speedB
half the crankshaft speedC
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a speed independent of that of the crankshaft
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