问题
单项选择题
碳素钢管路对接环缝与管架距离应大于（）mm，并不得留在过墙和楼板内。
A.50
B.60
C.80
D.100
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
碳素钢管路对接环缝与管架距离应大于（）mm，并不得留在过墙和楼板内。
A.50
B.60
C.80
D.100
参考答案：B
According to the passage, which of the following is true
A．Americans have always believed that military might is correct.
B．Americans have dropped diplomatic solutions to political problems since Bush took office.
C．Americans have accused France of being ungrateful for its help.
D．Bush was thought by some to be seeking justification in attacking Iran in his address.