通过交通量()调查,可以论证和探讨现有公路网的合理性。
A.组成
B.构成
C.流量
D.比重
参考答案:D
在我国再生纸中使用废纸浆的比例约多少?
A.30%-50%
B.50%-70%
C.60%-80%
D.60%-100%
Sam_______ some knowledge of the computer just by watching others working on it..
A.brought up
B.looked up
C.picked up
D.set up