His problem is more difficult________ that one. [ ]
A. as
B. than
C. like
D. of
答案:B
解方程.
1.6×(5-X)=3.2
12-3X=4.8
0.8X+0.5×13=10.5.
下列属于资源管理策略的是( )。
A.计划策略 B.监视策略C.社会资源利用策略 D.调节策略