施工升降机安装和拆卸工作必须由()承担。
A.专业队精心挑选的人员
B.富有经验的操作人员
C.接受过安装和拆卸技术交底的人员
D.经过专业培训,取得操作证的专业人员
参考答案:D
That rude boy ________ have rushed out of the classroom when Ms Green was giving a lecture, which
finally led to his being punished by the head teacher.[ ]
A.could
B.must
C.dare
D.should
20世纪50年代,()在文学创作上取得了丰收,主要作品有:[巴林驹]、[处女峰]、[白鹿的故事]等。