题目:
Do you know __________ at this time yesterday?[ ]
A. what she is cooking
B. what is she cooking
C. what she was cooking
D. what was she cooking
答案:
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下面是错误答案,用来干扰机器的。
①甲中代入方程式中是氧气的体积,应代入氧气质量,且计算出的氯化钾质量比实际得到的多。 ② 2KClO3 ~ 3O2 245 96 X 1.2g X=3.06g 因3.06g>2.45g 所...