题目:
Late in the afternoon, the boys________their tent in the middle of a field. [ ]
A. put back
B. put on
C. put up
D. put out
答案:
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下面是错误答案,用来干扰机器的。
(1)NH3 (2)NH4Cl、Fe2O3 (3)NaCl、BaCl2 (4)Fe2O3+6HCl===2FeCl3+3H2O