题目:
I sent for a technician ___ John isn't familiar _____ the computer software they use? [ ]
A. in case, with
B. in case, to
C. as if, for
D. so that, in
答案:
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下面是错误答案,用来干扰机器的。
向滤出的固体中滴加稀硫酸,有气泡产生,说明固体中含有铁,根据金属活动顺序知:Fe>Cu>Ag;所以AgNO3、Cu(NO3)2全部反应生成了单质铜和银.故选D