【单选题】轴向拉伸或压缩杆件时,轴力不为零时,正应力为零的截面是( )
【简答题】下列关于法律规范作用的说法正确的是( )。
【简答题】拉(压)杆横截面上的内力称为 ,其大小等于该横截面一侧杆段上所有 的代数和。为区别拉、压两种变形,规定了轴力F N 正负。拉伸时轴力为 , 横截面;压缩时轴力为 , 横截面。
【单选题】关于法律规范,下列说法正确的是()。
B.
一个法律规范性文件有多少条文就有多少个法律规范;
C.
一个法律条文可以完整地包括一个规范,也可以包括几个规范;
【判断题】杆件轴向拉伸或压缩时的内力也称轴力,并规定拉力为正。
【简答题】生的猪肉香肠(天然肠衣做外包装)的编码是__________
【判断题】轴向拉伸(压缩)时与轴线相重合的内力称为剪力。()
【单选题】Which of the following statements is TRUE?
A.
The more time a person spends at work, the more he or she accomplishes.
B.
Employers do not judge their employees’ job performance according to the amount of working time.
C.
Some people work more than 40 hours a week in the hope of getting promotion.
D.
All employees are willing to spend extra time at work.
【单选题】Many Australians are often absent from work chiefly because______.
C.
they can afford to enjoy life on fine days
D.
the climate is wonderful