梁受固定集中荷载作用,当局都挤压应力不能满足要求时,采用________是较合理的措施。
A. 加厚界缘
B. 在集中荷载作用处设支承加劲肋
C. 增加横向加劲肋的数量
D. 加厚腹板
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双袖对称工字形双面简支梁,跨中有一向下集中荷载作用于腹板平面内,作用点位于________时整体稳定性最好。
A. 形心
B. 下翼缘
C. 上翼缘
D. 形心与上冀缘之间
metropolitancrimestrolling suburbandouble-decked avenue robberies juvenile____ is one problem found in both urban and ____ areas. Elderly people are mugged whether they are hurrying along a city street or ____ down a suburban ____. Residents living in cities and suburbs hide in fear behind ____ doors, hoping to prevent robberies. In both the cities and the suburbs, big, vicious dogs are used as additional protection against ____. Even ____ crime is a growing problem as gangs increase in the ____ and suburban areas.
Give an oral translation for the following Help Wanted (口头翻译下列招聘启事).Help WantedWhirlpool is a company of manufacturing(生产) and marketing(经营) electric home appliances. Our headquarters is in Tianjin and we have over 20 subsidiaries(分公司) throughout the country. We are seeking for one sales manager now.Qualifications:Chinese citizen, aged from 25 to 40;With college diploma in Marketing or related field;Excellent ability of English speaking and writing;Skillful in using computer;Anyone interested please contact Miss Li at 82225655.
下列哪种方法最能够满足双因子认证的需求?
A. 智能卡和用户PIN
B. 用户ID与密码
C. 虹膜扫描和指纹扫描
D. 磁卡和用户PIN