涡轮流量计变送器后直管段长度应()的变送器口径。
A.小于20倍
B.大于或等于20倍
C.大于或等于15倍
D.小于15倍
参考答案:C
— Why don't we choose that road to save time?
— The bridge to it ___ [ ]
A. is being repaired
B. is repaired
C. has repaired
D. will be repaired