要清楚 负载的大小 . M# {- T2 p: ?8 V3 x
and then choose an actuator or pistion) J8 V6 z& J, k F+ r
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establish the flow and pressure profile" M; U) z$ J' H, y! W
0 f4 L8 ?/ R' x/ q: ufind out the horsepower you need 8 e" O* n6 m7 p* C; `5 m# d- s, G+ M; g/ U! E& n
be careful about the acceleration and deceleration period & F; [+ E& j2 i! _; u : \) V, K( W+ q& t# b4 Tquite agree with #2