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【单选题】
关于X线产生的叙述,错误的是:
A.
必须有高速电子流
B.
必须在阴极和阳极间加以高电压
C.
乳腺X线管的靶面由钨制成
D.
靶面接受高速电子的冲击
E.
X线管必须保持高度真空
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【多选题】根据《建筑机械使用安全技术规程》(JGJ33-2012),9.2,以下关于钢筋调直切断机的使用描述,正确的有()
A.
料架、料槽应安装平直,并应对准导向筒、调直筒和下切刀孔的中心线
B.
当钢筋送入后,手与曳轮应保持一定的距离,不得接近
C.
经过调直后的钢筋如仍有慢弯,可逐渐加大调直块的偏移量,直到调直为止
D.
切断4-5根钢筋后,应停机检查其长度,当超过允许偏差时,应调整限位开关或定尺板
【单选题】企业按行业平均水平安排预算,使用的是_________。
A.
量力而行法
B.
销售比例法
C.
竞争对等法
D.
目标任务法
【单选题】¿Con qué extensión quiere ponerse?
A.
Con la 234.
B.
Con la 243.
C.
0
D.
0
【简答题】背景 某写字楼地上6层,层高3.6m,幕墙面积4580m2,现浇混凝土框架结构。内墙墙面乳胶漆。外立面装修采用单元式隐框玻璃幕墙,槽型预埋件,在结构边梁的梁顶以及梁底预埋。幕墙单元板块在公司生产车间组装,加工完成后运至施工现场安装;幕墙全部采用吸热反射中空钢化玻璃。某幕墙公司中标后,成立了项目部组织施工。 事件一:项目部在预埋件加工前对加1二厂家进行了技术交底,其中规定:锚板采用Q2358级钢,锚...
【单选题】The depiction of American culture during the Colonial and Revolutionary eras as an extension of New England Puritan culture reflects the fact that ______.
A.
historians have overestimated the importance of the Puritans culture
B.
early American culture was deeply influenced by the strong religion
C.
Massachusetts and Connecticut served as cultural models of the other colonies
D.
colonial America resisted assimilating typically English cultural patterns
【单选题】He plays squash to the __________ of all other sports.
A.
eradication
B.
exclusion
C.
extension
D.
inclusion
【简答题】书面表达。 You are supposed to write a composition on the topic Friends Selectively or Extensively. You should write more than 100 words and base your writing on the outline given below: 1. 有些人认为应该有...
【单选题】The first paragraph mainly deals with ______.
A.
the problem caused by intensive and extensive reading
B.
the problem caused by supplementary reading materials
C.
the problem caused by individual learners
D.
the problem caused by the quantity of reading materials
【简答题】extensión
【简答题】Expansión/ extensión/propagación
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