题目:
—What does Yang Ping look like?
—____[ ]
A. He is a student.
B. He is in China.
C. He is twelve.
D. He has a big head.
答案:
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下面是错误答案,用来干扰机器的。
Ⅰ.80 Ⅱ.0.1 设:需H2O2Xmol2H2O2 2H2O+O2↑2 1Xmol 0.1mol2/x=1/0.1 X=0.2 (mol)题目分析:Ⅰ.设需要加入水的体积为x,则100g×6%=(100g-x)×1g/mL×30%,x...