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【单选题】
How did the editors deal with the letters from the readers?A.
They put some letters in a big postbag for reference.
B.
They did nothing but keep all the letters for reference.
C.
They looked up some information in the letters and then published in Postbag.
D.
They published some letters in the column (专栏)—Post bag and kept the rest for reference.
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反馈参考答案：
举一反三
【判断题】物业服务企业的业务内容包括基本业务、辅助业务及内部业务等。物业服务企业一业为主、多种经营、微利服务、规模管理的基本特性，决定了其业务内容狭隘性的特点。()
A.
正确
B.
错误
【简答题】LTI离散时间系统为因果系统的充要条件是其系统函数的收敛域包含 。
【单选题】What did the teacher tell them to do?
A.
Not to forget it.
B.
To finish Ex. 4.
C.
To finish Ex. 5.
【简答题】鹅口疮、疱疹性口炎、溃疡性口炎之中哪一个口炎具有传染性?
【简答题】完成下列练习 Ex. 20C Ex. 21C EX. 23A EX. 23 E
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