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已知:某松螺栓连接,所受最大载荷FQ=15000N,载荷很少变动,螺栓材料的许用应力[σ]=140MPa,则该螺栓的最小直径d1为( )mm。[2011年真题]
属于紧张引起的生理反应
岗位知识的测验内容不包括()。
目前生产的旋转阳极X线管靶面采用的材料为()
哪一年,我国海洋法律法规体系现已初步建立?()
下列选项中,不属于我国建造师注册类型的是()。
目前,中国的一个主要战略目标是将海洋种植业、养殖业和捕捞业形象比喻为“蓝色农业”,最终目的在于开发食用蛋白质。
框架梁最不利内力组合有()
在《如何避免愚蠢的见识》中,作者认为避免愚蠢见识的方式有()
评价氯化消毒的简便指标是()。
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