中低熔铸造合金包埋材料的结合剂是
A.磷酸二氢铵B.磷酸二氢镁C.氧化镁D.石英粉E.硬质石膏
参考答案:E
We young people shouldn’t think about the failure in the past. Instead, we should be to face the future.
A.usually; enough brave
B.seldom; enough brave
C.sometimes; brave enough
D.always; brave enough
妇联大厦是______联合会所在地。P116