单项选择题
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
A.advance
B.cavitation
C.edging
D.slip
点击查看答案&解析
相关考题
-
单项选择题
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
A.a not knowing
B.an unknowing
C.an unknown
D.a not known -
单项选择题
Anchors are prevented from running out when secured by the（）.
A.brake
B.devil's claw
C.pawls
D.All of the above -
单项选择题
An LWT anchor often has difficulty tripping in（）.
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
