传动精度敲、工作平稳、无噪声、易于自锁、能传递较大的扭矩,这是()的特点。 A.螺旋

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问题:

传动精度敲、工作平稳、无噪声、易于自锁、能传递较大的扭矩,这是()的特点。

A.螺旋传动机构

B.蜗轮蜗杆传动机构

C.齿轮传动机构

D.带传动机构

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患者男,28岁,因“咳嗽2个月”就诊,白天为主。有时伴反酸、胃灼热。为明确患者咳嗽是否与胃食管反流有关,宜首选的检查措施是()。

A.上消化道钡餐造影

B.胃镜

C.24h食管pH监测

D.咳嗽敏感性试验

E.纤维喉镜检查

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窗体在屏幕上显示后有 ______ 种方法可以清除它。

A.1种

B.2种

C.3种

D.4种

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心肌梗死后综合征表现不包括()

A.心包炎

B.胸膜炎

C.肺炎

D.发热

E.心肌炎

题型:单项选择题

Low levels of literacy and numeracy have a damaging impact on almost every aspect of adults, according to a survey published yesterday, which offers (1) of a developing underclass. Tests and (2) with hundreds of people born in a week in 1958 graphically illustrated the (3) of educational underachievement. The effects can be seen in unemployment, family (4) , low incomes, depression and social inactivity.

Those who left school at 16 with poor basic skills had been employed for up to four years less than good readers (5) they reached 37. Professor John Bynner, of City University, who carried the research, said that today’s (6) teenagers would even encounter greater problems because the supply of (7) jobs had shrunk.

Almost one fifth of the 1,700 people interviewed for yesterday’s report had poor literacy and almost half (8) with innumeracy, a proportion (9) other surveys for the Basic Skills Agency. Some could not read a child’s book, and most found difficult (10) written instruction.

Poor readers were twice as likely to be a low wage and four times likely to live in a household where partners worked. Women in this (11) were five times as likely to be (12) depressed, (13) both tended to feel they had no control over their lives, and to trust others (14) .

Those who had low literacy and numeracy were seldom (15) in any community organization and less likely than others to (16) in a general election. There had been no (17) in the literary level of (18) reporting problems.

Alan Wells, the agency’s director, said: “ The results emphasize the dangers of developing an underclass people, who were out of work, (19) depressed and often labeled themselves as (20) . There is a circle of marginalization, with the dice against these people and their families.”

3()

A.defect

B.backwardness

C.handicap

D.scarcity

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