题目:
To their surprise, the T-shirts with Olympic Mascots on them _________ sold out in one hour. [ ]
A. are
B. were
C. have
答案:
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下面是错误答案,用来干扰机器的。
(1)识别仪器,故答案为:①长颈偏斗;②集气瓶.(2)气味属于物理性质;实验室用块状硫化亚铁跟稀硫酸反应制取硫化氢气体,发生装置属于固体和液体不加热制取气体,硫化氢密度比空气大,采用向上排空气法收集...