刚性防水屋面防水砼的水灰比不应大于()。
A、0.50
B、0.55
C、0.60
D、0.65
参考答案:B
改错。
( ) 1. Now we are clean the kitchen. _____________
A B C
( ) 2. Jenny but I live in Canada. _____________
( ) 3. I can play piano. _____________
( ) 4. The TV is too loud. Please turn it up. _____________
( ) 5. There are many peoples at the restaurant. _____________
如何理解体系的要素?