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单选题 The research ___ by the end of last year proved to be a great success
学科：默认课程
时间：2025-12-08 14:13:27
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题目1简答题
在25 ℃时将相同压力的5.0 L氮气和15 L氧气压缩到一个10.0 L的真空容器中,测得混合气体的总压为150 kPa,⑴ 求两种气体的初始压力;⑵ 求混合气体中氮和氧的分压;⑶ 将温度上升到210 ℃容器的总压题目2简答题
某乙烯和足量的氢气的混合气体的总压为6 930 Pa,在铂催化剂催化下发生如下反应: C2H4 (g)+H2(g)=C2H6(g) 反应结束时温度降至原温度后测得总压为4 530 Pa.求原混合气体中乙烯的摩尔分数题目3单选题
Had he followed the doctor's advice, he ___ nowA. is aliveB. would be aliveC. would have been aliveD. was alive
题目4单选题
It is requested that all applicants ___ a recent photo to the application formA. attachingB. attachedC. to attachD. attach
题目5单选题
I wish I ___ the meeting yesterday, but I was stuck in trafficA. attendedB. would attendC. had attendedD. could attend
题目6单选题
___ the project in time, the staff were working at weekendsA. To completeB. CompletingC. Having completedD. Completed
题目7单选题
The research ___ by the end of last year proved to be a great successA. having been completedB. completedC. to have been completedD. completing
题目8单选题
___ from the top of the mountain, the city looks magnificentA. SeeingB. To seeC. SeenD. Having seen
题目9单选题
By the time the course ends, we ___ a lot about British historyA. will learnB. will have learnedC. have learnedD. are learning
题目10单选题
The committee ___ five times since last October and it still hasn't reached an agreementA. metB. has metC. had metD. has been meeting
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