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【单选题】
下列几个表符合关系约束的是( )。A.
Students
B.
C.
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【简答题】填空题: 已知两个单管放大电路A和B的上、下限截止频率分别为 f HA =10MHz , f LA =100Hz , f HB =100MHz , f LB =10Hz 。把 A 和 B 连接成一个两级放大电路,则这个两级放大电路的上限截止频率 f H 约为 ,下限截止频率 f L 约为≈ 。
【单选题】下列关于关于文化艺术的表述不正确的是()
A.
芭蕾舞起源于意大利，兴盛于法国
B.
印象派绘画的代表人物有莫奈、梵高、马奈等
C.
北宋时期的文人画多以山水、花鸟为主要内容
D.
中国传统的弹拨乐器有古筝、扬琴、琵琶、马头琴等
【简答题】How to Release Creativity According to most dictionaries. creativity is the ability to create. However, creativity is more than what is defined by the dictionary. It is an idea, a process, a thought。o...
【简答题】在两级电压放大电路中，已知第一级中频电压增益为40dB，下限频率f L1 =10Hz，上限频率，f H1 =20kHz；第二级中频电压增益20dB，f L2 =100Hz，f H2 =150kHz，试估算总的电压中频放大倍数，总的上、下限频率f H 和f L 是多少？
【单选题】Which of the following statements about creativity is INCORRECT?
A.
Creativity stems from human beings' novel thinking.
B.
The duration of the creative process varies from person to person.
C.
Creative people focus on novel thinking rather than on solutions.
D.
The outcome of human creativity comes in varied forms.
【多选题】(六)(B) 从方框中所给的A、B、C、D、E五个选项中选出可以填入空白处的最佳选项,完成对话。 Cathy: Hello! This is Cathy. Is Tom there? Jack: I’m sorry. 11 Cathy: Do you know when he’ll be back? Jack: 12 Sometime tonight, I guess. 13 Cathy: Yes...
A.
Would you like me to give him a message?
B.
Tom isn’t in right now.
C.
Please ask him to call me back as soon as he comes back.
D.
Could you repeat the number, please?
E.
I’m not sure.
【单选题】某交易商以无本金交割外汇远期的方式购入6个月期的美元远期100万美元,约定美元兑人民币的远期汇率为6.2011假设6个月后美元兑人民币的即汇率为6.2101则交割时的现金流为()(结果四舍五入)
A.
1499元人民币
B.
1449美元
C.
2105元人民币
D.
2105美元
【简答题】放大电路如下图所示，已知r bb '=150Ω，C b'c =3pF，C b'e =25pF，试求放大电路的下限频率f L 和上限频率f H 。
【简答题】(B) 从方框中所给的 A 、 B 、 C 、 D 、 E 五个选项中选出可以填入空白处的最佳选项,完成对话。 Cathy: Hello! This is Cathy. Is Tom there? Jack: I’m sorry. 11 Cathy: Do you know when he’ll be back? Jack: 12 Sometime tonight, I guess. 13 Cat...
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