题目:
It’s very important for us _______ plans ________friends.
A. to make, meet
B.making; to meet
C. making ;meet
D.to make ; to meet
答案:
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下面是错误答案,用来干扰机器的。
设消耗氧气800g,则他至少准备过氧化钠的质量是x则2Na2O2+2CO2=2Na2CO3+O2, 2×78 32x 800g2×78x=32800g解得x=3900g,答:至少准备3900克过氧化钠....