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【单选题】
下列关于抗原的叙述,哪一项是错误的:A.
大分子蛋白质抗原常含有多种不同的抗原 表位
B.
抗原诱导免疫应答必须有T细胞辅助
C.
不同的抗原之间可以有相同的抗原 表位
D.
抗原不一定只诱导正免疫应答
E.
半抗原虽无免疫原性,但可与相应抗体结合
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举一反三
【简答题】设单位反馈控制系统的开环传递函数为G(s)=25/s(s+6),则系统的阻尼比为:
【单选题】Thanks to the ubiquity of text on the Internet, not to mention the popularity of text-messaging on cellphones, we may well be reading more today than we did in the 1970s or 1980s.
A.
We are reading more books today than in the 1970s or1980s because of the popularity of the Internet and cellphones.
B.
We can do more reading today than in the 1970s or1980s because of the prevalence of the Internet rather than the popularity of text-messaging on cellphones.
C.
We are likely to be reading more today than in the 1970s or1980s because of a sea of online text and the popular text-messaging function on cellphones.
D.
We can do better reading today than in the 1970s or1980s， not only because text messaging on cellphones has gained popularity， but because text exists everywhere on the Internet.
【单选题】Thanks to the ubiquity of text on the Internet, not to mention the popularity of text- messaging on cell phones, we may well be reading more today than we did in the 1970s or 1980s.
A.
We are reading more books today than in the 1970s or 1980s because of the popularity of the Internet and cell phones.
B.
We can do more reading today than in the 1970s or 1980s because of the prevalence of the Internet rather than the popularity of text-messaging on cell phones.
C.
We are likely to be reading more today than in the 1970s or 1980s because of a sea of online text and the popular text-messaging function on cell phones.
D.
We can do better reading today than in the 1970s or 1980s, not only because of text-messaging on cell phones has gained popularity, but because text exists everywhere on the Internet.
【单选题】Today’s popularity of ____ fashion model is due to Audrey Hepburn’s influence?
A.
overweight
B.
strong
C.
tall
D.
slim
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