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问题 单项选择题

关于交通标志的设置要求，说法错误的是( )。

A．交通标志应设置在驾驶人员和行人易于见到，并能准确判断的醒目位置
B．交通标志一般安设在车辆行进方向道路的左侧或分隔带上
C．交通标志通常距人行道路缘石(或路肩)0.3～0.5m处
D．交通标志的高度应保证标志牌下缘至地面高度有1.8～2.5m

答案

参考答案：B

解析：本题考核的是交通标志的设置要求。交通标志应设置在驾驶人员和行人易于见到，并能准确判断的醒目位置；一般安设在车辆行进方向道路的右侧或分隔带上；通常距人行道路缘石(或路肩)0.3～0.5m处；其高度应保证标志牌下缘至地面高度有1.8～2.5m。

填空题

电空制动控制器手把在过充位时，因（）不得电，故机车呈（）状态。
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单项选择题

The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially (1) the Depression of the 1930’s, the United States experienced a (2) birth rate. Then with the prosperity (3) on by the Second World War and the economic boom that followed it, young people married and (4) households earlier and began to (5) larger families than had their (6) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (7) economics was probably the most important (8) , it is not the only explanation for the baby boom. The increased value placed (9) the idea of the family also helps to (10) this rise in birth rates. The baby boomers began streaming (11) the first grade by the mid-1940’s and became a (12) by 1950. The public school system suddenly found itself (13) The wartime economy meant that few new schools were buih between 1940 and 1945. (14) , large numbers of teachers left their profession during that period for better-paying jobs elsewhere.

(15) , in the 1950’s, the baby boom hit an antiquated and inadequate school system. Consequently, the custodial rhetoric of the 1930’s no longer made (16) ; keeping youths ages sixteen and older out of the labor market by keeping them in school could no longer be a high (17) for an institution unable to find space and staff to teach younger children. With the baby boom, the focus of educators (18) turned toward the lower grades and back to basic academic skills and (19) . The system no longer had much (20) in offering nontraditional, new, and extra services to older youths.

6（）

A.predecessors

B.successors

C.processors

D.oppressors
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