()、()和()称为砼配合比的三个参数。
参考答案:水灰比;砂率;单位用水量
The present question is ____ many students consider it impossible ____ is really possible if effort is made.
A.what; that
B.that ; that
C.that; what
D.what; what
课程标准将()确定为三维目标。
A.过程和方法
B.情感态度和价值观
C.教材编写
D.知识和能力