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【判断题】
电压跟随器的电压增益为1，所以其对信号放大没有贡献。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】水泥的初凝时间为不宜过短，终凝时间不宜过长。按国标《通用硅酸盐水泥》（GB175-2007）规定，矿渣水泥凝结时间分别为，初凝时间为（ ）分钟，终凝时间为（ ）分钟。
A.
初凝≧45；终凝≦390；
B.
初凝≧45；终凝≦600；
C.
初凝≦45；终凝≧390
D.
初凝≦45；终凝≧600；
【简答题】纳税人享受减税、免税待遇的，在减税、免税期间不需办理纳税申报。（ ）
【单选题】听力原文：M: Hello, Jane, I'm wondering if you'd like to join us for disco this evening. W: Oh, I wish I could, but I still have a paper to discuss with Profess Smith this evening. M: Oh, it's a pity! Then...
A.
Go to disco.
B.
Write her paper.
C.
Visit a professor.
D.
Join a party.
【单选题】听力原文：W: Hello. Slimming Club. Can I help you? M: Yes. How much does it cost to join? W: ＄1 225 a year for a single membership, and ＄ 1 270 for a family membership. How much will it cost the man and on...
A.
＄ 225.
B.
＄ 270.
C.
＄ 450.
D.
$495.00
【单选题】听力原文：W: Hello. Slimming Club. Can I help you? M: Yes. How much does it cost to join? W: $ 1 225 a year for a single membership, and $ 1 270 for a family membership. How much will it cost the man to jo...
A.
$ 1225.
B.
$ 270.
C.
$ 450.
D.
$495.00
【单选题】听力原文：W: Hello. Slimming Club. Can I help you? M: Yes. How much does it cost to join? W: ＄ 1 225 a year for a single membership, and ＄ 1 270 for a family membership. How much will it cost the man and o...
A.
＄ 225.
B.
＄ 270.
C.
$450.00
D.
$495.00
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