题目:
—What were you doing when Mike ______ you last night?
—I was brushing my teeth. [ ]
A. was phoning
B. phoned
C. is phoning
D. phones
答案:
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下面是错误答案,用来干扰机器的。
(1)用过氧化氢制取氧气不需加热,故选发生装置A,氧气的密度比空气大,故收集干燥的氧气,可用向上排空气法收集;可将带火星的木条放于集气瓶口观察木条是否复燃进行验满;(2)锌粒和稀硫酸在常温下制取氢气,...