如图 [tex=3.286x1.143]Jzcs7Jyzfrswux3hBy/hIg==[/tex] 所示, 等直杆的横截面面积 [tex=4.643x1.214]IUXAI6rgakBDJWozxF2GfUHrpUCA4e/GoUPh8CX/CRs=[/tex], 弹性模量 [tex=5.0x1.0]A27JgWnQ8GPYbPqYiryk6LB6uN/20+EU9cC82xEiQq4=[/tex], 所受轴向载荷[tex=3.571x1.214]fTuts9SKsaDJYJJEv/PproO6t04ggP8WhET/V55msTA=[/tex] 、 [tex=3.571x1.214]2EMpXV7t6omipHioIIJbOkGDfobHJ5d77cLmrIckU/0=[/tex]。试计算杆内的最大正应力与杆的轴向变形。[img=318x145]17cf072519e7f70.png[/img]

下列检索式描述错误的是 A: subjterm(3304) and "TITLE-ABS-KEY"(learning) B: ①((education* or instructional) w/1 (technique or technology)) and ("class participation" or "classroom participation" or "student participation")<br/>②1.((education* or instructional) w/1 (technique or technology)) and ((class* w/1 participation) or "student participation")<br/>①和②的检索结果一样。 C: 检索“白血病的诊断和治疗”可输入检索式为 leukemia and (diagnosis or therapy) D: (hig* w/3 (tech * or educat*)or part*) not ( pra* or class) w/9 marxism 检索式正确。