为了防止发生露点腐蚀，烟道气温度不应低于（）℃A.230 B.210 C.175 D

直线y=2x+1向上平移两个单位得到直线（    ）。

The fire was completely ________ shortly afterwards with the help of the firemen.         

A．cut down

B．put out

C．give out

D．floated away

□里能填几？

（1）商是一位数：

□08÷32□里能填______．7□3÷75□里能填______．□32÷64□里能填______．

（2）商是两位数：

□21÷62□里能填______．3□9÷34□里能填______．6□4÷58□里能填______．

His money had not brought happiness and perhaps it had contributed________ his strange sense of values.

A．up

B．for

C．as

D．to

喷射混凝土厚度的检查叙述错误的（）。

A.拱部不得少于三个检查点。

B.每个断面所有检查孔支护厚度50%不得小于设计厚度。

C.检查孔中最小支护厚度不得小于设计厚度的50%。