单选题The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains （）.Aa magnetic operating coilBnormally open line contactsCthermal-overload protectionDa momentary-contact start button
单选题
The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains （）.
A
a magnetic operating coil
B
normally open line contacts
C
thermal-overload protection
D
a momentary-contact start button
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