在普通气候环境中的混凝土优选用普通水泥,也可以使用矿渣、火山灰、粉煤灰水泥。
参考答案:对
()鸡易感鸡蛔虫病
A.10~20日龄
B.1~2月龄
C.3~4月龄
D.5~6月龄
E.7~8月龄
All his friends’ encouragement _____ his confidence in winning the game.
A.added up to
B.added up
C.added to
D.added