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【单选题】
A) She made a mistake by taking too few courses in the first term. B) The courses she took were too difficult for her. C) She took too many courses during her first term. D) She found it difficult to deal with college courses.A.
She made a mistake by taking too few courses in the first term.
B.
The courses she took were too difficult for her.
C.
She took too many courses during her first term.
D.
She found it difficult to deal with college courses.
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举一反三
【单选题】下列关于数据和数据分析的说法正确的是
A.
数据就是数据库中的表格
B.
文字、声音、图像这些都是数据
C.
数据分析不可能预测未来几天的天气变化
D.
数据分析的数据只能是结构化的
【单选题】电路分析计算，如图2所示，已知电路参数：Vcc = 12v，R1=500k，R2=2k，R3=10k，C1=100μF，C2=100μF，三极管Q1的β=150。计算IB、IC、IE、UCE分别是（ ）。【图片】
A.
0.022A ， 3.3A， 3.322A， 5.4 V
B.
0.015mA ， 1.2mA， 1.115mA， 9.5 V
C.
0.022mA ， 3.3mA， 3.322mA， 5.4 V
D.
0.22mA ， 33mA， 33.22mA， 1.4 V
【单选题】用555定时器构成的单稳态电路如图12-3所示。已知电源电压V=10V，R=33kΩ，C=0．1μF，则输出电压的脉冲宽度为（）mS。
A.
10
B.
3.3
C.
1
D.
3.63
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