3.Whydidthepeoplewantthepubtostaythereforever?
A. Becauseitwasownedbyarichperson.
Becauseitwastheonlymeetingplaceforpeople.
C. Becauseithasalwaysbeenstandingthere.
D. Becauseithadaspecialplaceinthecity’shistory.
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1.WhatisunusualaboutPennsylvaniaStateUniversity?
A. Itteachesstudentshowtoraisecows.
B. Itteachesstudentshowtotasteicecream.
C. Itoffersaclasstoteachhowtomakeicecream.
D. Itsellsninedifferentflavorsoficecreamoncampus.
2.WhatdoesDr.BobRobertsdo?
A. Hesellsicecreamattheuniversityicecreamstore.
B. HeworksforapopularAmericanicecreamcompany.
C. Hemanagesafarmwhichproducesmilktomakeicecream.
D. Heteachesstudentshowtomakeicecreamattheuniversity.
受轴向载荷的紧螺栓联接，为保证被联接件不出现缝隙，因此______。
A. 残余预紧力FR应小于零
B. 残余预紧力FR应大于零
C. 残余预紧力FR应等于零
D. 预紧力F0应大于零
一箱体与箱盖用螺纹联接，箱体被联接处厚度较大，且材料较软，强度较低，需经常拆装箱盖进行修理，则一般宜采用______联接。
A. 双头螺栓联接
B. 螺栓联接
C. 螺钉链接
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