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草酸比甲酸更易发生()
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  • 第一次国共开始合作的时间是()。中国近现代史纲要
  • Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. 1 , medical authorities express their concern about the effect of smoking 2 the health not only of those who smoke but also of those who do not. In fact, non-smokers who must involuntarily inhale (吸入) the air 3 by tobacco smoke may suffer more than the smokers 4 . Smoking is prohibited in the theatres and in halls used for showing films 5 in laboratories 6 there may be a fire hazard (危险). Elsewhere, it is up to your good 7 . I am 8 asking you to maintain "No-Smoking" in classrooms and seminar rooms. This will prove that you have the 9 health in mind, which is very important to a large 10 of our students. (1)(1分)A、StillB、FurtherC、MoreD、Again(2)(1分)A、inB、toC、onD、with(3)(1分)A、pollutingB、be polluted C、pollutedD、to be polluted(4)(1分)A、themB、themselvesC、their ownD、they(5)(1分)A、andB、butC、as well asD、also(6)(1分)A、whereB、whichC、thatD、how(7)(1分)A、feelingB、senseC、realizeD、think(8)(1分)A、soB、nextC、thereforeD、and(9)(1分)A、non-smokersB、non-smokers'' C、non-smoker''sD、non-smoker(10)(1分)A、number B、amountC、manyD、much新发展英语综合教程(二)
  • 49、尼日利亚助手基金属于【 】 A. 非洲开发银行集团 B. 亚洲开发银行 C. 美洲开发银行 D. 世界银行集团投资学
  • [程序题]     在图示零件上钻孔。请采用教材中给定的代码格式(JB3208—83)编制加工程序。        要求:        (1)在给定工件坐标系内用增量尺寸编程,图示钻尖位置为坐标原点;        (2)坐标原点为程序的起点和终点,钻孔顺序为Ⅰ→Ⅱ→Ⅲ;        (3)进给速度50mm/min,主轴转速600r/min;        (4)钻通孔时,要求钻头钻出工件表面4mm。
  • [单选题] 在交往中表示尊敬和礼貌的用语是( )。 A.敬语 B.谦语 C.雅语 D.俚语酒店服务礼仪
  • 水利建设对环境的负效应有______。( )环境水利学