水泥抹灰砂浆、水泥粉煤灰抹灰砂浆和掺塑化剂水泥抹灰砂浆宜在干燥条件下养护。
参考答案:错
-How often does your daughter watch TV?
- __________. [ ]
A. once time a week.
B. Twice a week.
C. Twice times a week
D. Third time a week.
1991年,美国的戈尔参议员首先提出了建立()设想。