地面操作的起重机手电门的电压为（）。
A.220V
B.36V
C.380V
参考答案：B
No matter ______ the CRH accident in Wenzhou, it had and will have much warning significance.
A．how the investigators said caused
B．what the investigators said caused
C．why the investigators said caused
D．the investigators said how caused
结算
