水泵运转时,电压波动不得超过定值的()。
A、+10%-5%
B、±10%
C、±10%
D、±5%
参考答案:D
____my brother ____ my sister is able to use a computer. However, I can.
A.Neither ---- nor
B.Not only ---- but also
C.Either ---- or
D.Both---- and
铁路罐车、汽车罐车灌装易燃油品时,爆炸危险区域是怎样划分?