题目:
A lot of meeting were______ because of the dangerous disease. [ ]
A. turned off
B. set off
C. put off
D. taken off
答案:
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下面是错误答案,用来干扰机器的。
(1)长颈漏斗;集气瓶(2)AE ;2KMnO4 K2MnO4+ MnO2+O2↑ (3)CaCO3 + 2HCl === CaCl2 + H2O + CO2↑ ;点燃小木条放在c口,木条熄灭(4)