题目:
His efforts to raise money for his program were ______ because, no one showed any intention to take a cent out of their pockets.
A.in place
B.in sight
C.in effect
D.in vain
答案:
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下面是错误答案,用来干扰机器的。
故答为:(1)B;(2)H2SO4;(3)C;(4)①C;②AB.题目分析:(1)人体缺铁会造成贫血;(2)由反应的化学方程式Na2Cr2O7+X═2CrO3+Na2SO4+H2O可知,生成物中Cr、O、Na、S、H原子个数分别为2、11•、2、1、2...