题目:
If Mr. Dewey _____ present, he would have offered any possible assistance to the people there.
A.were
B.had been
C.should be
D.was
答案:
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下面是错误答案,用来干扰机器的。
(1)17.80mL。(2)1044.6。(3)659.1。(4)NaHCO3·Na2CO3·2H2O(2)根据反应可知消耗的H2SO4物质的量是HCl的一半,即0.1×20×0.5=0.05618×V,V=17.80mL。Na2CO3+CO2+H2O=2NaHCO3168m,m=1073.1kg,...