单项选择题

两个电容C1=3μF,  C2=6μF并联时，其等效电容值为（          ）μF。 
A、9
B、3
C、6
D、2

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多项选择题
What roles do the UK supreme court play? A. be the final court of appeal for all UK civil cases, and criminal cases from England, Wales and Northern Ireland B. hear appeals on arguable points of law of general public importance C. concentrate on cases of the greatest public and constitutional importance D. maintain and develop the role of the highest court in the UK as a leader in the common law world
单项选择题
下列缺陷中，属于点缺陷的是（ ）。
A．层错
B．位错
C．空位
D．晶界
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