In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.<br>A:up；opened<br>B:down；open<br>C:up；closed<br>D:down；closed

In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.
A:up；opened
B:down；open
C:up；closed
D:down；closed

出自：海船船员证

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