轻集料混凝土小型空心砌块按（）分类为单排孔、双排孔、三排孔、四排孔等。
参考答案：砌块孔的排数
Not only_______polluted but_______crowded.
A．was the city;were the streets
B．the city was;were the streets
C．was the city;the streets were
D．the city was;the streets were
使用电工钢丝钳剪切导线时，要用（）
A.刀口
B.铡口
C.齿口
D.钳口
