大于或等于()mm的焊接钢管,对接时应采取双面焊接并清根。
A.500
B.800
C.1000
参考答案:C
______ , his work became famous for the absence of Rhyme at the end of each line . [ ]
A. Once published
B. When to publish
C. After is published
D. While publishing
除尘器的技术性能参数不包括()
A.除尘效率
B.压力损失
C.负荷适应性
D.耗能量