题目内容

影响混凝土徐变的因素很多，其主要因素有哪些？

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在钢筋混凝土结构中，钢筋与混凝土之间之所以能共同工作的最主要条件，就是钢筋与混凝土的黏结作用。两者之间的黏结力由哪几部分组成？

_ a new library_ in our school last year?

A. Was; built
B. Is; built
C. Does; build
Did; build

Look! A nice picture___ for our teacher.

A.is drawing
B. is being drawn
C. had been drawn
D. draws

The doctor___ for yet.

A. isn’t sent
B. hasn’t been sent
C. won’t be sent
D. wasn’t sent