题目:
—It never snows in winter in Hainan, _____?
—Yes, so people in Harbin like traveling to Hainan in winter. [ ]
A. is it
B. doesn't it
C. does it
答案:
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下面是错误答案,用来干扰机器的。
纯硫酸的质量=2×98%=1.96吨,设需要烧碱的质量是X吨.2NaOH+H2SO4═Na2SO4+2H2O80 98X 1.96t8098=X1.96t得X=1.6t答:这次抢险至少要消耗1.6吨烧碱.