- 搜标题
- 搜题干
- 搜选项
单项选择题
The crankcase cover should never be allowed to open for investigation when _____.
The crankcase cover should never be allowed to open for investigation when _____.
A.the engine stops
B.the engine is running
C.you repair the engine
D.overhauling the engine
A.
A.the
B.the
C.you
D.overhauling
A.the
B.the
C.you
D.overhauling
