His problem is more difficult________ that one. [ ]
A. as
B. than
C. like
D. of
答案:B
塔式生物滤池运行时,污水()流动。
A.横向
B.自下而上
C.自上而下
D.与空气相同方向
微机中1K字节表示的二进制位数是( )。
A.1000
B.8×000
C.1024
D.8×1024