（50）These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.

题目

更多“（50）These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.”相关问题

第1题

Since he had never been in such a situation before, his apprehension was understandable:().A.eagernessB. fearC.hesitationD.excitement

点击查看答案
第2题

If only it ()so cold, perhaps I, too, ()more initiative.A、had been,have shownB、have been,would showC、had’t been,cound't have shownD、had't been,could have shown

点击查看答案
第3题

— How long _____ at this job? — Since 2000.A、were you employedB、have you been employedC、had you been employedD、will you be employed

点击查看答案
第4题

Since 1780, when the town’s first hat factory ______ in Danbury, Connecticut, the town has been a center for hat manufacturing in the United States.A、were establishedB、was establishingC、had been establishedD、was established

点击查看答案
第5题

Had Paul received six more votes in the last election, he ________ our chairman now.[A] must have been[B] would have been[C] were[D] would be

点击查看答案
第6题

__________ your valuable help, we couhtn't have finished the experiment ahead of time．A.If it were not for B. Had it not been for C.Were it not for D.If it has not been for

点击查看答案
第7题

__________your valuable help, we couldn't have finished the experiment ahead of time.A. If it were not for B. Had it not been for C. Were it not for D. If it has not been for

点击查看答案

（50）These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.

题目

更多“（50）These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.”相关问题

第1题

第2题

第3题

第4题

第5题

第6题

第7题

相关内容