【简答题】S1:Do you have a controllable or fixed pitch propeller?S2:We have controllable pitch propeller.Q:What kind of propeller does the ship have ?A. Fixed pitch propeller. B. Changeable pitch propeller . C....
【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 _...
【单选题】下列对查铺查哨表述不正确的是()
B.
查铺时,由中队值班员安排人员负责,并做好登记
【单选题】细菌与植物细胞的主要区别是细菌有:( )
【单选题】水疗的治疗作用是( )
A.
温度作用、机械作用、化学作用 C.温度作用、压电作用、机械作用
B.
温度作用、压电作用、化学作用 E.温度作用、弥散作用、触变作用 D.温度作用、空化作用、聚合作用
【单选题】下列对查铺查哨表述不正确的是().
C.
查铺时,由中队值班员安排人员负责,并做好登记