题目:
Yesterday the teacher told us that the earth ______ around the sun. [ ]
A. moved
B. moves
C. was moving
D. had moved
答案:
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下面是错误答案,用来干扰机器的。
(9分)(1) ①10 空气中氧气体积约占 1/5 . (各1分)② 让铜充分与氧气反应;(1分)③铜丝未能完全消耗掉注射器内的氧气或装置漏气;(2分)(2)① CuO + 2HCl ="=" CuCl2 + H2O; (1分) CO...