During the parallel operation, ______ must be used.
A.
ammeter
B.
voltmeter
C.
synchroscope
D.
all the above
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【简答题】用be动词的适当形式填空。 1. What _____ your name? 2. My telephone number _____ 2746598. 3. This _____ my ID number. 4. My family name _____ Black. 5. Helen and Gina _____ girls.