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【简答题】
阅读下面短文,从短文后所给各题的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。 On August 26, 1999, New York City was struck by a terrible rainstorm. The rain caused the streets to 16 and the subway system almost came to a stop. Unfortunately, this happened during the morning 17 hour. Many people who were going to work were 18 to go home. Some battled to 19  a taxi or to get on a bus. Still others   20 the storm bravely, walking miles to get to work. I happened to be one of the people on the way to work that morning. I went from s ubway line to subway line only to find that most 21 had stopped. After making my way through crowds of people, I finally found a subway line that was 22 . Unfortunately, there were so many people waiting to 23 the subway that I could not even get down the stairs to the 24 . So I took the train going in the 25 direction, and then switched back to the downtown train. Finally, after what seemed like forever, the train 26 my stop. Then I had to walk several blocks in the increasingly heavy rain. When I finally got to my office, I was 27 through, exhausted and discouraged. My co-workers and I spent most of the day drying off. When it was 5:00 pm,I was ready to go home. I was about to 28 off my computer when I received an email from Garth, my Director: I would like to thank all of you who made the 29 and eventually reported to work. It is always reassuring (令人欣慰的), at times like these, when employees so clearly show their attention and devotion to their 30 . Thank you. 小题1:. A.break B.flood C.sink D.crash 小题2:. A.rush B.work C.business D.office 小题3:. A.forced B.refused C.invited D.gathered 小题4:. A.order B.pay C.call D.search 小题5:. A.showed B.fought C.broke D.faced 小题6:. A.practice B.routine C.process D.service 小题7:. A.operating B.acting C.turning D.rushing 小题8:. A.check B.get C.board D.find 小题9:. A.street B.ground C.floor D.platform 小题10:. A.different B.opposite C.changed D.right 小题11:. A.paused B.crossed C.reached D.parked 小题12:. A . wet B. hungry   C. angry    D. cold 小题13:. A.pay B.get C.turn D.put 小题14:. A.rule B.effort C.promise D.model 小题15:.. A.computers B.lives C.actions D.jobs
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【简答题】用 万 用表的欧姆挡测量阻值约为几十 k Ω的电阻 R x ,以下给出的是可能的操作步骤,其中 S 为选择开关, P 为欧姆挡调零旋钮,把你认为正确的步骤前的字母按合理的顺序填写在下面的横线上。 a .将两表笔短接,调节 P 使指针对准刻度盘上欧姆挡的零刻度,断开两表笔 b .将两表笔分别连接到被测电阻的两端,读出 R x 的阻值后,断开两表笔 c .旋转 S 使其尖端对准欧姆挡 Í 1k d ....
【简答题】中学物理实验“伏安法测电阻”,其测量电阻的理论依据为欧姆定理,请思考该实验中“外接法”和“内接法”对测量结果产生的影响。2、惠斯通电桥实验用“比较法”测量待测电阻,是将哪两个电阻进行比较从而确定待测电阻的阻值的?试从实验原理角度比较本实验和“伏安法测电阻”的异同。3、电桥法中的“四臂一桥”分别指的是“图4.10.1惠斯通电桥原理图”中的哪些支路?4、什么是电桥灵敏度? 5、什么叫电桥平衡?如何判断...
【简答题】(8分) (1)用多用表的欧姆档测量阻值约为几十kW的电阻Rx,以下给出的是可能的操作步骤,其中S为选择开关,P为欧姆档调零旋钮,把你认为正确的步骤前的字母按合理的顺序填写在下面的横线上。 a.将两表笔短接,调节P使指针对准刻度盘上欧姆档的零刻度,断开两表笔 b.将两表笔分别连接到被测电阻的两端,读出Rx的阻值后,断开两表笔 c.旋转S使其尖端对准欧姆档í1k d.旋转S使其尖端对准欧姆档í100...
【单选题】在火焰原子吸收分析中,分析灵敏度低,研究发现是在火焰中有氧化物粒子形成,指出哪种措施是不适当的()。
A.
提高火焰温度
B.
加入保护剂
C.
改变助燃比使成为富燃火焰
D.
预先分离干扰物质
【简答题】一个可供使用的多用表,K为选择开关, T 为欧姆挡调零旋钮,现在要用它检验两个电阻的阻值,已知阻值分别为 R 1 =6 . 0Ω和 R 2 =47kΩ,下面提出了测量过程中一系列可能的操作,请你选出尽可能准确地测定各阻值和符合多用电表安全使用规则的各项操作,并且将它们按合理的顺序填写在后面横线上的空白处。万用表的表盘如下面第 6 题甲图所示。 A .旋动 K ,使其尖端对准欧姆挡× 1k B .旋...
【单选题】.洗衣服务分为快洗和慢洗入普通服务),费用相差(),需要向客人说明,以免结账时出现争执。
A.
.30%
B.
.40%
C.
.50%
D.
.0..6
【简答题】用欧姆表的两测试棒分别连接JFET的漏极和源极,测得阻值为R1,然后将红棒(接负电压)同时与栅极相连,发现欧姆表上阻值仍近似为R1,再将黑棒(接正电压)同时与栅极相连,得欧姆表上阻值为R2,且R2《R1,试确定该场效应管为N沟道还是P沟道。
【多选题】在火焰原子吸收分析中,分析灵敏度低,研究发现是在火焰中有氧化物粒子形成,请指出采取()措施可改善。
A.
提高火焰温度
B.
加入保护剂
C.
改变助燃比使成为富燃火焰
D.
预先分离干扰物质
【判断题】孕妇两次空腹血糖值≥5.8mmol/L,可以诊断为糖尿病。( )
A.
正确
B.
错误
【单选题】某孕妇,G1P0,孕37周,头位,胎心150次/分,骨盆测量正常,宫高40cm,腹围110cm,孕期体重增加16kg,门诊以妊娠期糖尿病收入院。 妊娠期糖尿病的诊断标准错误的是
A.
随机空腹血糖测量≥5.8mmol/L
B.
50g糖筛查试验:1h血糖≥11.2mmol/L
C.
75g糖耐量试验:四项中有两项及两项以上达到或超过正常值
D.
75g糖耐量试验:一项异常为糖耐量受损
E.
50g糖筛查试验:1h血糖≥7.8mmol/L
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