题目内容

三菱变频器中代表高速(1速)的符号是()。

A. RH
B. RM
C. RL
D. RS

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三菱变频器中低速段(3速)的频率由参数()设定。

A. Pr4
B. Pr5
C. Pr6
D. Pr7

( )组合可实现第4段速。

A. RH、RM
B. RM、RL
C. RL、RS
D. RS、RH

( )组合可实现第7段速。

A. RH、RM
B. RM、RL
C. RL、RH、RS
D. RL、RH、RM

n. a tall machine with a long arm, used to lift and move building materials and other heavy objects; a large bird with long legs and a long neck

A. cloak
B. crane
C. craft
D. drawer