单项选择题 In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause （）.

单项选择题 Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?（）

单项选择题 When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as （）.