单项选择题
A.It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary
B.The auxiliary gear could be power operated in passenger ships
C.The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed
D.All moving parts of the steering gear must be guarded against any possible damage
单项选择题 With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）
单项选择题 With reference to a radial piston pump, which one of the following statements is false?（）
单项选择题 With reference to an axial piston pump, which one of the following statements is true?（）