皮皮学，免费搜题
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【单选题】
游客被毒蛇咬伤后,导游员可以用小刀按毒牙痕的方向切横各()厘米的十字形口,再设法把毒素吸出或挤出,导游员口腔溃疡不可实施。A.
0.5
B.
1
C.
1.5
D.
2
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皮皮学刷刷变学霸
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【单选题】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
【单选题】The pitch of a propeller is a measure of the（）.
A.
angle that the propeller makes with a free stream of water
B.
angle that the propeller makes with the surface of the water
C.
number of feet per revolution the propeller is designed to advance in still water without slip
D.
positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip
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【单选题】S1: Do you have a controllable or fixed pitch propeller? S2: We have a controllable pitch propeller. Q: What kind of propeller does the ship have?
A.
Fixed pitch propeller
B.
Changeable pitch propeller
C.
Invariable pitch propeller
D.
Inflexible pitch propeller
【简答题】S1:Do you have a controllable or fixed pitch propeller?S2:We have a fixed pitch propeller.Q:What type of propeller is it?A. It is a right-hand propeller. B. It is a left-hand propeller. C. It is a var...
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