在其他条件相同时,若受轴向拉伸的杆件横截面面积增加一倍,则杆件横截面上的正应力将减少( )。
A. 1倍
B. 1/2
C. 2/3
D. 3/4
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横截面面积不同的两根杆件,受到大小相同的轴力作用时,则( )。
A. 内力不同,应力相同
B. 内力相同,应力不同
C. 内力不同,应力不同
D. 内力相同,应力相同
函数f(x)在[a,b]上连续是f(x)在[a,b]上可积的()
A. 充分非必要条件
B. 必要非充分条件
C. 充分必要条件
D. 既非充分也非必要条件
函数f(x)在[a,b]上有界是f(x)在[a,b]上可积的()
A. 充分条件
B. 必要条件
C. 充分必要条件
D. 既非充分也非必要条件
选词填空:You will find how(1) the Nazi racial theory was. They were even unable to tell who did and did not (2) to their “master race.” Hessy Levinsons Taft was born in Germany right after Hitler came to (3) . When she was six months old, her parents had her picture (4) . They put it on the piano as a private family photo. (5) , to their (6) , the picture soon appeared on the cover of a Nazi magazine. Being Jews/Jewish, they were afraid of (7) . So they contacted the photographer to find out what had happened. The photographer explained that he had sent in his 10 best pictures for a competition/contest run by the Nazis, and that he had included Hessy’s picture in his (8) as a joke. As it happened, Hessy was picked as the perfect Aryan baby. Within weeks, Hessy’s picture was seen everywhere. The whole story was the (9) irony for the Nazi (10) theory.A)Nonetheless B)perfect C)horror D)taken E)idiotic F)racist G)mistaken H)submissions I)surging J)ultimate K)Definitely L)belong M)exclaimed N)power O) publicity