A:Sorry, he is busy at the moment.
B:Why didn't you call earlier?
C:Certainly. May I know your name?
D:Sorry, he doesn't want to see you.
①彰显了社会主义制度集中人力、物力办大事的优势
②标志着我国已实现进入创新型国家行列的奋斗目标
③有利于推动科技自主创新,增强高端装备制造实力
④有利于打破国外客机生产垄断,主导世界客机市场
常用的水银温度计是根据液体的____ 规律制成的;在烈日当空下的海边沙石热得烫脚,而海水却是凉凉的,这主要是由于海水的 ____ 比沙石的大.