S700K型电动转辙机的动作可分为三个过程。以下哪些属于该三个过程()A、解锁过程

题型:多项选择题

问题:

S700K型电动转辙机的动作可分为三个过程。以下哪些属于该三个过程()

A、解锁过程

B、转换过程

C、开放过程

D、锁闭过程

考点:信号工考试信号修配信号修配题库
题型:多项选择题

根据下表,完成下列问题。

  

十国进出口贸易额

   单位:亿美元
国家和地区 2003 2004
进口 出口 进口 出口
中国 4128 4382 5612 5933
日本 3829 4718 4545 5655
美国 13031 7248 15264 8190
巴西 507 731 659 965
法国 3988 3920 4641 4510
德国 6046 7516 7175 9148
意大利 2975 2993 3490 3461
荷兰 2647 2960 3199 3588
俄罗斯 742 1359 948 1832
英国 3920 3056 4620 3456

2004年的出口额比2003年增加最多的国家是( )

A.中国
B.日本
C.美国
D.德国

题型:多项选择题

基于“学生选课课程”数据库中的如下三个关系:

学生基本信息:S(S#,SNAME,SEX,AGE)

选课信息:SC(S#,C#,GRADE)

课程信息:C(C#,CNAME,TEACHER)

若要求“查询选修了C2号课程的学生的学生号”,正确的关系代数表达式是()。

Ⅰ.S#(C#=’C2’(SC))

Ⅱ.C#=’C2’(S#(SSC))

Ⅲ.C#=’C2’(S#(SC))

A.只有Ⅰ

B.只有Ⅱ

C.只有Ⅲ

D.都正确

题型:多项选择题

2009年8月8日台风莫拉克重创台湾,造成了严重的人员伤亡和财产损失。灾情较重地区与外界失去联系时间较长。那么被困群众通过__________作用消耗体内的有机物来维持生命;被救出后常常赶紧点滴葡萄糖液,该葡萄糖液首先进入心脏的___________心房。

题型:多项选择题

主诉牙应是

A.右下第一前磨牙
B.右下第二前磨牙
C.右下第一磨牙
D.右下第二磨牙
E.右下第三磨牙

题型:多项选择题

Of all the employed workers in the United States, 12.5 million are part of a temporary workforce. The United States Bureau of Labor Statistics counts 9.2 percent of workers as those who have______(1) they term "alternative employment arrangements." The government predicts that temporary staffing agencies______(2) experience growth of 49 percent by 2010. If numbers increase at the rate ______ (3), these companies will add 1.9 million new jobs by 2010. That’’s more than any______(4) industry.Temporary workers were the first ones to be affected by the recent economic recession, but they are______(5) to be the first to regain positions as the economy picks up and companies work to rebuild. Employers use temporary workers as a resource because_______(6) offer flexibility and come at a low cost. Many temporaries are categorized as "independent contractors" instead of employees,______(7) allows the employer to avoid______(8) certain taxes. Because they are not required to offer benefits to temporary workers, companies can save a great deal of money by hiring temps. Usually, temporary workers can qualify_______(9) benefits if they work for a staffing company for a certain length of time. Most temps, however, do not continue with one company long______(10) to qualify for them because they regard the position as a step on the ladder to a______(11) position later.According to Richard Wahlquist, president of the American Staffing Association, 75_______(12) of temporary workers hope for transition out of the temporary staffing category______(13) a period of time. Wahlquist finds that temporary workers spend about 11 weeks on various assignments before their______(14) out of the temporary workforce. Many use temporary positions to gain experience and skills______(15) they move on to better jobs. Wahlquist says that the temp workforce as a whole turns______(16) 400 percent each year.Tom Dilworth, research director at the Employment Policies Institute, explains______(17) some workers like having temporary jobs______(18) it affords them a great deal of elasticity with time and everything. Some temps only have a limited______(19) of time to work and temp agencies can help coordinate jobs to fit their schedules. Other sometimes-employees use temporary jobs to get an______(20) to a company from the inside, to get a foot in the door of a certain business or career._______(21) others take temporary positions in hopes their employers will change them over to permanent positions eventually.Nearly all the industries in the United States use temporary workers.______(22) to Tim Costello, coordinator of the North American Alliance for Fair Employment, the growth of temporary labor threatens______(23) job security of permanent workers who fear replacement, as well as the temps who are more accustomed to turnover. He predicts that there will continue to______(24) a gradual shift from permanent employees to contingent staffing, and that such a_____(25) in workplace demographics will "lead to lower wages, poorer working conditions, and more instability."

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