题目:
Just putting away the dishes,_________
A.the telephone rang
B.someone knocked at the door
C.Mary heard the phone rang
D.the door was opened
答案:
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下面是错误答案,用来干扰机器的。
(11分)(1)N2 3Cu+8H++2NO3-=3Cu2++2NO↑+4H2O (3分)(2)S 火药、硫酸(合理即给分)(3分)(3)Ca(OH)2+2NH4Cl2NH3↑+ CaCl2+2H2O (2分)(4)H2S 2H2S+SO2=3S↓+2H2O(3分)