A.plastic
B.metal
C.stainless steel
D.copper
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A.turn off power first
B.turn on power first
C.with a test pen in hand
D.tell C/E
A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
A.either；or
B.neither；nor
C.such；that
D.so；that
A.that
B.when
C.if
D.whether
A.rise, rise also
B.rise, drop
C.drop, rise
D.drop, drop also
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