【单选题】We’ve had problems supplying some of our retail _________.
【单选题】_____ clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
【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】On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).
D.
drilled passages in the crankshaft
【单选题】在“中学为体,西学为用”的思想指导下,我国从清末开始试图建立现代学制,在颁布的诸多学制中,第一次颁布的现代学制是( )。
【单选题】The crank pin journal is provided with large bores for _____.