根据被控制的参数和用途的不同，比例阀也可分为（）控制阀三大类。
A.压力
B.流量
C.方向
D.温度
参考答案：A, B, C
2log25-log216=______．
Every day Mother sets about her housework ______ she returns from work. Which of the following
is NOT OK? [ ]
A. immediately
B. the moment
C. the minute
D. in no time
