怎样调节油压？
参考答案：
用油压调节阀调节油压。向顺时针方向转动油压增高，逆时针转动油压下降。调整油压一般比吸气压力高1－2Kg/cm2
A ship is side to be（）when the bow and stern rise and fall with the oncoming waves.
A.rolling
B.pitching
C.heaving
D.swaying
