适合输送100℃以上,含有二氧化碳的酸性水管是()
A、碳钢管
B、衬塑管
C、奥氏体不锈钢管
D、低合金管
参考答案:C
-Look! That man looks like Mr Brown.
-It _____ be him, for he _____ America.
A. can't;has gone to B. may not;has gone C. can't;has been to