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【单选题】
在直齿圆柱齿轮设计中，若中心距保持不变，而把模数增大，则可以A.
提高齿面接触强度
B.
提高轮齿的弯曲强度
C.
弯曲强度与接触强度均可提高
D.
弯曲强度与接触强度均不变
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】毒理学研究中提倡3R原则是指
A.
reptacement＼reduction＼refinement
B.
replacement＼recovery＼refinement
C.
replacement＼reduction＼reference
D.
replacement＼recovery＼reactivity
E.
replacement＼recovery＼reference
【单选题】遗传密码的摆动性是
A.
一个氨基酸有两个或两个以上密码子
B.
从低等生物到人类都用同一套遗传密码
C.
mRNA上的密码子与tRNA反密码子应完全配对
D.
线粒体翻译系统有独立的密码子
E.
mRNA上的密码子第3位碱基与tRNA反密码子第1位碱基不严格配对
【简答题】Climate change connected with the reduction of wetlands at the source of the country's two longest rivers， the Yangtze and the Yellow， has reduced the volume of water flowing into them， scientists sai...
【单选题】Statistics show a 20% reduction in burglary _____with last year. [ ]
A.
compared
B.
comparing
C.
having compared
D.
having been compared
【单选题】Cost Reduction Programs Marketing Exclusive Inc. provides customized cost reduction plans which are designed to improve profitability. These plans are very structured and will cover a wide range of co...
A.
Analyzing existing financial conditions.
B.
Interviewing department heads.
C.
Developing specific guidelines.
D.
Establishing goals of cost cutting plan.
【单选题】毒理学研究中提倡3R原则是指
A.
replacement/reduction/refinement
B.
replacement/recovery/refinement
C.
replacement/reduction/reference
D.
replacement/recovery/reactivity
E.
replacement/recovery/reference
【单选题】动物试验的“3R”原则不包括
A.
减少(reduction)
B.
优化(refinement)
C.
限制(restriction)
D.
替代(replacement)
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