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【单选题】
某晶体三极管的IB 从20μA变化到40μA时,对应的IC从2mA变化到5mA,则该管的β等于 ( )。A.
100
B.
150
C.
200
D.
300
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知识点：
皮皮学刷刷变学霸
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【简答题】补全单词admi( )( )ion
【单选题】Federal efforts to aid minority businesses began in the 1960’s when the Small Business Administration (SBA) began making federally guaranteed loans and govern- ment-sponsored management and technical ...
A.
The use of MESBIC’s for aiding minority entrepreneurs seems to have greater potential for success than does the original SBA approach.
B.
There is a crucial difference in point of view between the staff and directors of some MESBIC’s.
C.
After initial problems with management and marketing, minority businesses have begun to expand at a steady rate.
D.
Minority entrepreneurs wishing to form. new businesses now have several equally successful federal programs on which to rely.
E.
For the first time since 1960, large corporations are making significant contributions to the development of minority businesses.
【简答题】admi__ __ __ __n
【单选题】女性,28岁,已经乙状结肠镜检查发现距肛缘4 Cm处有一直径为2 Cm的肿块,病理检查为腺癌,未见远处转移,最佳的手术方法为
A.
.Mil Es手术(腹会阴联合根治术)
B.
.直肠前切除根治术
C.
.保留肛门括约肌拉下式直肠癌根治术
D.
.经肛门直肠癌局部切除术，术后放疗
E.
.经乙状结肠镜切除肿瘤，术后化疗
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