混凝土中掺入减水剂,可在保证工作性和强度不变的条件下,节约水泥的用量。 ()
查看答案
混凝土掺入引气剂,使混凝土的密实度和抗冻性均降低。
A. 对
B. 错
[音频]I know that it might sound _____ crazy(来源:歌曲《I Knew I Loved You》)
A. really
B. a little
[音频]_____, he was a gifted student and he followed current events very closely. (来源:博客《世界名人简介》)
A. Obviously
B. Unexpectedly
[音频]A kind of what the speechwriting gurus from the Oratory Laboratory to _____. (来源:CNN新闻)
A. point out
B. make clear