单项选择题

紫外光具有（ )，因此在表面接枝改性时不会影响本体性能，改进聚合物的润湿性和黏接性。

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单项选择题

Which one of the activities in the Qingming Festival caters to its category of agricultural festival?
A、The farmers begin to cultivate their land.
B、The farmers begin to harvest the crops.
C、People go out to enjoy the beautiful spring.
D、People go to the tomb to worship their ancestors.

请列举泡茶用水的处理方法。

答案： 1.过滤法。购置理想的滤水器，将自来水经过过滤后，再来冲泡茶叶。
2.澄清法。将水先盛在陶缸，或者无异味、干净...