In the past we were made ______ heavy manual work in the countryside.

A. to do
B. do
C. doing
D. having done

If ______ heavy pressure, cast iron will crack.

A. subjected to
B. having subjected to
C. subject to
D. to subject to

He was quite ________ and was promoted almost at once.

A. brilliant
B. tremendous
C. appropriate
D. prompt

______ slang I did not hear much of it, though a young lady who had changed her clothes after an afternoon dance did say that "after the heel kick she shifted her day goods".

As against
B. As good
C. As for
D. As is

干燥的石材试样重500g，浸入水中吸水饱和后排出水的体积为190cm3，取出后抹干再浸入水中排开水的体积是200cm3，求此石材的表观密度、体积吸水率和重量吸水率。

称取堆积密度为1400kg/m3的干砂200g装入广口瓶中，然后瓶中加满水赶尽气泡，称其质量为500g。已知空瓶加满水的质量为377g。求砂的表观密度与空隙率。

材料的吸水性强弱用（ ）表示。

A. 软化系数
B. 含水率
C. 吸水率
D. 吸湿率

当材料的润湿边角（ ）时，称为憎水性材料。

A. ＞90°
B. ＜90°
C. ＝0°
D. ≥90°

用于吸声的材料，要求其具有（ ）孔隙的多孔结构材料，吸声效果越好。

A. 大孔
B. 开放、互相连通
C. 封闭小孔
D. 开口细孔

材料在外力作用下，无显著塑性变形而突然破坏的性质，称为（ ）.

A. 塑料
B. 韧性
C. 脆性
D. 刚性