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聚会时你会……

A. 没过多久你就感觉无聊，想回去
B. 一直精力充沛，直到散场

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回家后，你会……

A. 感觉疲惫，倒头就睡
B. 依然意犹未尽，兴奋不已

In hydraulic transmission system, the commonly used to control the direction of the oil is

A. throttle valves
B. speed regulaing valves
C. relief va;ves
D. directional control valves

When a two-position, five-way directional control valve is at any position, how many oil ports on the valve core?

A. 2
B. 3
C. 4
D. 5

___________________allow several actuator notions to obey the setting scheduled actions in turn.