The pumps press oil into the cross-head bearing gap when the load on the shell is at its lowestWhat is the meaning of “its” in the sentence above？
A.the cross-head
B.the pumps
C.the shell
D.the load
时间：2023-08-29 12:15:29
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The cylinder oil is pumped into the cylinder （via non-return valves) when the piston rings
The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during ______.
A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke
