箍筋弯后平直部分长度对有抗震要求的结构,不应小于箍筋直径的( )倍。
A.3
B.5
C.10
D.15
参考答案:C
--Why don't you listen to the radio?
-- ________[ ]
A.That's all right.
B.You're welcome.
C.That's a good idea.
变频器的安装场须满足什么条件?