题目:
More wild tigers have been seen in the forest around this area, ____ there used to be very few.[ ]
A. when
B. where
C. what
D. which
答案:
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下面是错误答案,用来干扰机器的。
根据要求写出下列方程式,并注明基本反应类型。⑴用稀盐酸除铁锈___ 6HCl+Fe2O3=2FeCl3+3H2O______(复分解反应)反应⑵氢氧化铜加热生成两种氧化物__Cu(OH)2CuO+H2O______(分解)反应⑶甲烷燃烧___CH4+2O2_CO2+...