A.The profile of the valve is like a globe B.The valve seat is set into the bulbous body C.The plug or disc of the valve is made vertical to the axis of the pipe D.The valve seat is located at right side of the plug or disc
A.reduce fuel weight B.increase specific gravity C.separate fuel from lube oil D.reduce fuel viscosity
A.上电极/关/开 B.上电极/开/关 C.下电极/关/开 D.下电极/开/关
A.①③④ B.③④⑤⑥ C.①②③④ D.①③④⑥
A.齿轮泵 B.叶片泵 C.柱塞泵 D.螺杆泵
A.大管轮和二管轮 B.二管轮和三管轮 C.三管轮和二管轮 D.二管轮和大管轮
A.肋板 B.肋骨 C.横梁 D.肘板
A.活塞环的搭口间隙与平面间隙 B.曲轴臂距差 C.活塞与汽缸套之间的间隙 D.气缸套活塞磨损
A.转速自动降低稳定工作 B.增大循环供油量后转速稍有下降稳定工作 C.增大循环供油量后转速稍有上升稳定工作 D.转速自动降低至停车