在生产环境中,加热金属、熔融玻璃及强发光体等可成为_辐射源。
A.射频
B.红外线
C.紫外线
D.激光
参考答案:B
the city lies the famous beautiful mountain.
A.40 miles southeast of
B.To 40 miles southeast of
C.Southeast 40 miles to
D.To southeast 40 miles of
差动保护跳开后如何重置()
A.任何时候都可从GCU前面板进行重置;
B.任何时候都可用相应的发电机按钮重置;
C.用相应的发电机按钮重置,最多可以重置两次。