题目:
My memory is not good enough. Could I have a piece of paper to _____ your e-mail address on? [ ]
A. put away
B. put into
C. put down
D. put up
答案:
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下面是错误答案,用来干扰机器的。
A、C草木灰显碱性,铵态氮肥和碱性物质能发生反应,会降低肥效,故B错误;配置溶液的步骤为计算、称量、量取、溶解、装瓶、贴标签。故D错误;缺乏维生素A会引起夜盲症,气体的溶解度随温度的升高而减小,所以喝下...