公称外径（）323.9mm的管，可提供镀锌钢管。
A.不大于
B.不小于
C.大于
D.小于
参考答案：A
看图选择填空，将正确选项的编号写在括号内。
( ) 1. Have you got a car?
A. Yes, I have.
B. No, I haven't. I've got a bike.
( ) 2. Has she got a new dress?
A. Yes, she has.
B. No, she hasn't.
( ) 3. Has Sam got a toy ship?
A. Yes, he has.
B. No, he hasn't.
( ) 4. Have you got a sweater?
B. No, I haven't. I've got a T-shirt.
ZD（J）9系列电动转辙机保养工作：检查配线线束的状态的时间间隔为（）。
A.1个月
B.2个月
C.3个月
D.4个月
