题目:
In my opinion, what matters is not how much a present costs, _____what it means to you. [ ]
A. however
B. nor
C. either
D. but
答案:
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(1)家用净水机常使用活性炭净水,其利用了活性炭的吸附性.故填:吸附. (2)餐具上的油污用加入洗洁精的水更易清洗,是利用了洗洁精的乳化作用.故填:乳化.(3)氢气燃烧能生成水,反应的化学方程式为:2H...