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【简答题】
工业炼铁 （1）原理：在高温下，利用还原剂______将铁矿石里的铁______出来． 一氧化碳还原氧化铁的实验现象：______，澄清石灰水变______，尾气燃烧产生______火焰． 下面是该实验主要步骤：①检验装置的气密性、②装入药品并固定、③向玻璃管内通入一氧化碳气体、④给氧化铁加热、⑤停止加热、⑥停止通入一氧化碳．正确顺序：______ （2）原料：铁矿石、焦炭、石灰石和空气 ①焦炭的作用：______、______； ②石灰石的主要作用______． （3）主要设备：高炉．高炉中发生的主要反应有：______、______、______．
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【简答题】葡萄胎清宫术后应避孕______________年,宜采用______________。
【单选题】When he was the director of the company, his first accomplishment was to improve the working conditions.
A.
plan
B.
purpose
C.
achievement
D.
task
【单选题】He ______ unwisely, but he was at least trying to do something helpful[1999]
A.
may have acted
B.
must have acted
C.
should act
D.
would act
【单选题】- ______ he _____ on the farm(农场)? -Yes, he does. He' s a good farmer. [ ]
A.
Does, work
B.
Is, working
C.
Does, do
【简答题】It is sensible for him to act as if he were mad in the court, because in that case, he would ______(免受法律的惩罚).
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