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【判断题】
两个电容器的电容和额定工作电压“10μF25V”，“20μF15V”；现将它们并联后接在10V的直流电源上，则它们储存的电量分别是10 -4 C和2×10 -4 C，并联后等效电容是20μF，允许加的最大电压是15V；若将它们串接在30V的直流电源上，则它们的端电压分别为20V，10V，串联后等效电容为6.67μF，允许加的最大电压37.5V。A.
正确
B.
错误
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【单选题】I have a _________ daughter, she is a middle school student. [ ]
A.
thirteen years old
B.
three-year-old
C.
twelve-year-old
D.
fourteen-year old
【单选题】Dr. Hausman is a hair detective. Once a mountain lion killed a thirteen-year-old boy, The town offered a reward of one thousand dollars for anyone who would kill the lion. One day an excited hunter ca...
A.
what the weather was like the year Columbus landed in America
B.
what the weather was like last year in the mountain
C.
what the weather was like last month in your hometown
D.
what kind of tree the piece of wood came from
【简答题】排除偶然关联、虚假关联和伴随关联之后,暴露因素与疾病的关联是________。
【简答题】下列各句均有错误，请将错误画出并将其正确的形式改写在横线上。 1. Jim is thir year old. __________ 2. The nineth month is September. __________ 3. I am born in November. __...
【简答题】下列各句均有错误，请将错误画出并将其正确的形式改写在横线上。 1. Jim is thir year old. 2. The nineth month is September. 3. I am born in November. 4. When year were you born? 5. When is Leila birthday? 6. We have a speech conte...
【简答题】I am a boy . I`m thir year old. 小题1: I come from English . I`m a student . 小题2: I has a round face , a big nose , a small mouth , and s...
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