单项选择题
Wear occurring at the tips of the reduction gear teeth is usually the result of （）.
A.surface fatigue
B.fretting corrosion
C.heavy overloading
D.gear misalignment
点击查看答案&解析
相关考题
-
单项选择题
The following preparations are essential for any （） of marine diesel engine before it may be started.
A.doing
B.make
C.turn
D.operating -
单项选择题
The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.
A.why
B.which
C.in which
D.on which -
单项选择题
It was （）midnight that we removed the trouble and went back to our cabin.
A.until
B.not until
C.not before
D.not after
