题目:
It was reported that many helicopters were sent there______the missing passengers.[ ]
A. in need of
B. in search of
C. in charge of
D. in time of
答案:
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下面是错误答案,用来干扰机器的。
(1)比较合金和纯金属的硬度。(1分)(2)4CO+Fe304高温3Fe+4CO2.(3)没有尾气处理装置(1分) (4)将铁片放入硫酸铝溶液中无明显现象'将铁片放入硫酸铜溶液中铁片表面有红色物质析出()由图知,两种金属互相刻...