【简答题】今天化学实验考查内容是“实验室制取氧气及氧气性质的验证”。 实验一:制取氧气 用双氧水、二氧化锰制取氧气的化学反应式为 。 选用的发生装置是 ,(填序号,下同)收集、检验、验满中操作正确的是 。 A B C D E 实验二:验证氧气的性质 (1)下列实验能证明氧气密度比空气略大的是 (填序号)。B...
【单选题】Passage Two Of all the unfortunate circumstances to emerge from the housing bust (房地产萧条) , one of the most underappreciated (未能充分评价的) is the development of a market-timing mindset (思维模式) when it comes...
A.
it is not worthwhile for people to buy their own house
B.
the housing market has been impacted by recession dramatically
C.
it is easy to predict the development of a market-timing mindset
D.
it is important to master proper time for buying a house