采用普通硅酸盐水泥、碎石和天然砂配制混凝土,制作尺寸为100mm×100mm×100

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问题:

采用普通硅酸盐水泥、碎石和天然砂配制混凝土,制作尺寸为100mm×100mm×100mm试件3块,标准养护7d,测得破坏荷载分别为140kN、135kN、142kN。该混凝土7d标准立方体抗压强度为13.9MPa。

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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.

12().

A. creek

B. flood

C. bonus

D. pledge

题型:判断题

贞观初年,西行前往佛教圣地天竺求取佛经精义的唐朝高僧是()

A.鉴真

B.玄奘

C.晁衡

D.郑和

题型:判断题

医生违背伤害原则的是()

A.医生对病人的呼叫或提问给予应答

B.医生的行为使某个病人受益,但却给别的病人带来了损害

C.妊娠危及母亲的生命时,医生给予引产

D.医生给病人实施必要的检查或治疗

E.医生满足病人的一切要求

题型:判断题

《高层民用建筑设计防火规范》规定,建筑高度超过()的综合楼为一类高层建筑

A.20m

B.24m

C.39m

D.50m

题型:判断题

假设某程序语言的文法如下:
S→a|b|(T)
T→TdS|S
其中,VT=a,b,d,(,));VN=S,T,S是开始符号。考察该文法,句型(Sd(T)db)是S的一个 (28)
其中 (29) 是最左素短语, (30) 是该句型的直接短语。

A.S

B.S,(T),b

C.(Sd(T)db)

D.S,(T)Tds,b

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