气泡混合轻质土的发泡工艺中,将憎水剂与水泥按选定比例混合,干拌()直至混合均匀后加水预搅。
A.1min
B.3min
C.5min
D.10min
参考答案:B
Not only the children but also their mother ________ to go to the park.
A.want
B.wants
C.to want
D.is wanting
慢性阻塞性肺疾病的主要特征是()
A.大气道阻塞
B.小气道阻塞
C.双肺哮鸣音
D.桶状胸
E.X线胸片示肺纹理增粗