钢管扣件式脚手架主节点处必须设置一根横向水平杆，用直角扣件扣接且严禁拆除。
参考答案：对
—It's May 3rd. But I don't know the day. Can you tell me?
—_____.[ ]
A. It's very cold
B. It isn't May 2nd
C. It's Friday
D. It's his birthday
标准螺丝刀的长度规格指的是（）。
A.总长度
B.刀体的长度
C.木柄的长度
D.刀口的长度
