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【简答题】
比的后项一定时，比的前项和比值成正比例．______．
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反馈参考答案：
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.
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