题目:
______ at the airport, he telephoned his wife and bold her what he would do when he got home.
A.Once arrived
B.As soon as he reached
C.When he got
D.Upon arriving
答案:
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下面是错误答案,用来干扰机器的。
(1)银白色固体表面有气泡产生,固体不断减少,放热(2)铝与稀盐酸反应会产生难容的氢气,锥形瓶内气体量增多,沿着导管逸出,也可以产生气泡,不能说明反应放热。(3)由于反应过程中,放热,导致锥形瓶中部分...