[单选题]通信用光器件可以分为（）两种类型。-我要搜题网

[单项选择]Passage Three A college education is not just preparation for a career, however. In addition to taking course in their major field of study, students enroll in elective courses. They may take classes that help them understand more about people, nature, government, or the arts. Well-rounded people are likely to be better citizens, better parents and more interesting and interested individuals. Although two-thirds of American high school graduates go on to study in college, recent high school graduates no longer dominate the college campuses. Adults of all ages return to the classroom, either for new vocational skills or for personal growth. In 1966, for example, almost 20% of American college students were over age 35. Some 500,000 college students are over 50. American faith in the value of education is exemplified by the rising number of Americans who have at least a bachelor’s degree. Almost one-quarter of Americans over age 25 are college graduates. College attendance is not rese
A. social pressure
B. easy access to colleges
C. people’s faith in education
D. the large number of colleges

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[单项选择]在团体保险中，对被保险人资格进行限定的主要目的是（）。
A. 有效的减少或消除逆选择影响
B. 有效的降低管理成本
C. 降低企业的保费负担
D. 提高保险运作的效率

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[判断题]混合物中可燃物浓度低于下限时因含有过量的空气,空气的冷却作用会阻止火焰的蔓延。
A.正确
B.错误

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[单项选择]女性，20岁，1年来头晕、乏力，进食好，二便正常，化验Hb65g/L，MCV70fl，WBC5.5×10⁹/L，PIt290×10⁹/L，临床诊断为缺铁性贫血。为明确其发病原因，最关键的问诊是（）
A. 是否挑食
B. 胃病史
C. 肝病史
D. 月经史
E. 家族史

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[多项选择]金属栏杆、扶手的流行趋势（）。
A. 现场加工、现场安装
B. 工厂化加工，现场安装
C. 标准化
D. 外发加工
E. 联合承包

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[单选题]患儿,女,9个月。头颅迅速增大,四肢肌力下降,CT表现如图,首先考虑的疾病是
A.胼胝体发育不全
B.Dandy-Walker综合征
C.前脑无裂畸形
D.脑灰质异位
E.无脑回畸形

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[多项选择]正常人防止食管胃反流的机制是（）
A. 食管胃连接处的膈食管韧带、胃膈韧带起固定作用
B. 食管胃连接成锐角
C. 食管胃连接处位于膈下2～3cm处
D. 膈肌脚的剪刀力作用
E. 食管下段及贲门括约肌

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[单选题]用户供电可靠性综合管理信息系统中线段编码的前四位码代表（）
A.变电站名称
B.线路编码
C.电压等级编码

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[单项选择]What do you do to (21) care of the books in your library Some of the most collectors (22) to read the books in their collection; (23) the books remain in mint (24) . Others buy two copies of a book; they (25) one, and leave the other untouched. Many readers must read their books, (26) they still want to protect and care for the volumes. Here are some tips to remember (27) you want your books to remain in good condition.
Firstly, avoid Writing. You may have been told to (28) in the margins of your books, or even to underline or highlight words, phrases, and paragraphs. But, if you plan to (29) the book, add it to your library, or even sell it -- don’t write in the book. The ink permanently damages your book. Use a journal or notebook to take (30) on pages or use pieces of paper or Post-It notes. If you are (31) to write in your book, use a pencil, and erase the
A. while
B. before
C. after
D. since

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[单项选择]国际货协条文载于偶数页上，并在这些页的上端标有“协”字样，而在其（）页边上标有相应的内部业务指导性规定的项号。
A. 左侧
B. 右侧
C. 上面
D. 中缝

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[判断题]以有限责任公司、股份有限公司的房地产抵押的，必须经董事会或者股东大会通过。( )

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[判断题] 碳弧气刨在切割过程中,由于有压缩空气的存在,露天操作时, 应该注意逆风向进行操作,以防吹散的熔渣烧坏工作服和灼伤皮肤。( )
A.正确
B.错误

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[单选题]进入放射性工作区域,根据工作需要穿戴防护衣具,如防护服、手套、鞋罩、防护眼镜等,以及专用的( )等。
A.呼吸保护器
B.气衣
C.呼吸保护器、气衣
D.呼吸器

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[简答题]采区系统检查内容的重点有哪些？

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[判断题]在物流信息系统流程中，模块是储存具体任务数据的信息结构。