單項選擇題While the parallel operation, （） must be used.
A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
您可能感興趣的試卷
你可能感興趣的試題
1.單項選擇題When the bearing becomes dry from lack of oil, the motor shaft may heat to （）an extent （） it welds itself to the bearing.
A.either；or
B.neither；nor
C.such；that
D.so；that
2.單項選擇題An indicator on the main switchboard should show （） the emergency battery is in service or not.
A.that
B.when
C.if
D.whether
最新試題
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
題型：單項選擇題
Using a file without a handle may result in （）
題型：單項選擇題
The condensers located in various stages of a flash evaporator are cooled by（）
題型：單項選擇題
（） is not installed on the main switchboar.
題型：單項選擇題
Flame failure in an automatically fired auxiliary boiler can from a/an （）
題型：單項選擇題