含砂较重的土，碾压机械以振动式碾或夯为宜，最优含水量相对较大，含水量偏低就不易压实。
参考答案：对
在横线里填上“＞”、＜”或“=”．
29+38+62______29+100
45×12______45×26
23×98+2______23×100
48+75+52______76+100．
— ________ is it from your home to the factory?
— It's only 2 miles.[ ]
A. How long
B. How far
C. How about
D. How often
