煤气管道直管段每隔()设置一个人孔。
A、100m
B、150~200m
C、250m
参考答案:B
—What a fine day! Shall we go picnicking?
—________. But we need to be home before six o'clock for the football match.[ ]
A. Have a nice time
B. Pardon me
C. That's great
D. You are right
妊娠肿胀,又称
A.子病 B.胞漏 C.子肿 D.子痫 E.胞阻