【单选题】We’ve had problems supplying some of our retail _________.
【单选题】The crank-pin bearings are made of___
【单选题】Excessive clearances in the main or crank-pin bearings will sometimes be indicated by _____ before any bearing knock is heard.
A.
loss of flow in the fuel system
B.
loss of pressure in the air system
C.
loss of flow in the lubricating system
D.
loss of pressure in the lubricating system
【单选题】()成为一种最重要的公众参与社会管理的形式。
【单选题】《中国药典》(2015年版)共有部数为( )。
【单选题】The crank pin journal is provided with large bores for _____.