当长行程电磁铁瓦块制动器制动轮直径为200mm时，其允许的制动间隙为（）
A.0.5mm
B.0.7mm
C.1.0mm
参考答案：B
Alan his father and both of them are friendly.
A．looks after
B．takes after
C．feels like
D．is after
日均余额在（）万以上的客户，可以选择五位相同数字作为卡号。
A.500
B.1000
C.2000
D.5000
