无缝钢管自动化检验时的管端盲区应控制在多少以内？（）
A.50mm
B.100mm
C.150mm
D.200mm
参考答案：D
car on sale is used car. I have driven it for two years.
A．The…a
B．A…an
C．The…an
D．A…the
Do you know where _____ some maps? [ ]
A. can I buy
B. I buys
C. I can buy
