分组类型标识是由分组头第三个字节组成，用于区分分组的___。

手推车下坡时拉车人应在车前还是车后拉绳？

正常运行的活性污泥系统中，污泥本身是黄褐色或（）。

It’s___(reasonable)to expect people to work more than 60 hours a week.

At the end of the conference, all the_(participate) were asked to fill out a questiolmaire

Every boy and girl ___(treat) in the same way.

IP地址中的网络号所占位数越多，则一个网络内可以容纳的主机数（）。

One hundred miles ____(be) too far to travel on foot.

Each student is to give a short___ (speak)to the rest of the class at the end of the semester.

配合挖土机作业时，能否进入铲斗回转范围？