A、To show that the new method will not cause fire. B、To point out the danger of the old method. C、To explain a step in the new t

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问题  

选项 A、To show that the new method will not cause fire.
B、To point out the danger of the old method.
C、To explain a step in the new treatment.
D、To indicate the good quality of construction wood.

答案A

解析
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