以下哪些因素会直接影响到你对生物菌剂的选取、剂量的投放和投放方式的选
A. 受污染水体的水温
B. 受污染水体的pH值
C. 污染物种类和污染程度
D. 水体体积
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Let us go,_________?
A. shall we
B. will you
C. you know
D. why not
Hurry up or _____________________.
A. you can get there on time
B. you will miss the train
C. you can catch the bus
D. you will catch the plane