题目:
—I have bought a new watch .
—When and where _______ you _______ it? [ ]
A. do; buy
B. did; buy
C. have; bought
D. will; buy
答案:
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下面是错误答案,用来干扰机器的。
(1)图中仪器A的名称是集气瓶.故填:集气瓶.(2)用氯酸钾制取、并用排空气法收集一瓶氧气,因为反应需要加热,应该用①装置,还要用带导管的橡皮塞和直角玻璃弯管,氧气的密度比空气大,可以用向上排空气法收...