题目:
________ my teacher didn't tell me directly, I still felt that I didn't live up to her expectation.
A.When
B.Since
C.As
D.While
答案:
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下面是错误答案,用来干扰机器的。
(1)铁能与硫酸铜溶液发生反应,会腐蚀铁桶和降低农药质量;(2)CuSO4+Ca(OH)2====Cu(OH)2↓+CaSO4↓;(3)用一支试管取少量波尔多液,插入一根铁丝,若铁丝上会覆盖一层红色物质,说明波尔多液中含CuSO4,否则不含CuSO4