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【简答题】
金属热还原法广泛用于冶金过程中。用金属A（或其合金）作还原剂在高温下将另一种金属B的化合物还原以制取金属B（或其合金）的方法。通常是按还原剂来命名。 ⑴用铝作还原剂生产金属铬，称为铝热法。化学方程式为________________。铝的亲氧性除用于冶炼难熔，还用于制取耐高温的金属陶瓷。例如将铝粉、石墨和二氧化钛或其他高熔点金属的氧化物按一定比例混合均匀，然后在高温下煅烧，即生成耐热的(TiC)，该反应的化学方程式为________________。 ⑵用硅作还原剂还原V 2 O 3 冶炼钒，称为硅热法。化学方程式为________________。硅（特别是硅铁）的价格比铝低，所以硅热法在铁合金及某些金属的生产中占有重要地位。但硅的还原能力不如铝。为使硅热还原更易进行，常加入CaO作溶剂，试分析加入CaO的作用________________________________。 ⑶试写出克劳尔法用镁热还原TiCl 4 生产海绵钛的方程式________________。
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【判断题】In order to make an effective impromptu speech, you need to speak as fast as you can.
A.
正确
B.
错误
【多选题】In order to make an informed choice of research category, we need to know the advantages and disadvantages of both quantitative or qualitative research.Advantages of quantitative research include:
A.
Replicability: When people repeat a study, they obtain similar results.
B.
Objectivity: The findings are unbiased and independent from the individual researcher who conducts the study.
C.
Generalizability: The findings are applicable to larger populations.
D.
Quantitative research is good at discovering “what”it is out there or whether a hypothesis is valid.
E.
Quantitative research is suitable for finding out “why” it is so or“how”it happens.
【单选题】In order to make an effective communication, what type leader the captain should be?
A.
a participatory leader
B.
an authoritative leader
C.
a leader can balance act between the two types of management style, authoritative and participatory.
【多选题】In order to make an impressive PPT, what items should be announced in the first slide?
A.
The event
B.
The date
C.
Your name
D.
The title
【判断题】The classical decision-making model assumes that managers require very little or no information in order to make an optimum decision.
A.
正确
B.
错误
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