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根据回答，请选择问句。A. What are you doing with the blackboard?B. What are you doing with the black board?------ Writing on with a chalk

A. What are you doing with the blackboard?
B. What are you doing with the black board?

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根据回答，请选择问句。A. What are you doing with that hotdog？B. What are you doing with that hot dog？--- Giving him a drink.

A. What are you doing with that hotdog?
B. What are you doing with that hot dog?

根据回答，请选择问句。A. They are building a greenhouse.B. They are building a green house.--- Why are they so keen on green?

A. They are building a greenhouse.
B. They are building a green house.

根据回答，请选择问句。A. Can you show me the blueprint?B. Can you show me the blue print?------ We are still working on it.

A. Can you show me the blueprint?
B. Can you show me the blue print?

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