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【判断题】
铰用铰刀对未淬硬进行精加工的一种加工方法。A.
正确
B.
错误
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【简答题】两个空气介质平行板电容器 C 1 和 C 2 ,若两极板正对面积之比为 3:2 ,两极板间距离之比为 3:1 ,则它们的电容量之比为 。若 C 1 为 6 ,则 C 2 = μ F 。
【简答题】What will you do during your summer v___________?
【单选题】When do the A-V valves close during the cardiac cycle?
A.
when ventricular pressure exceeds that of the atria
B.
when pressure inside the ventricles is at its lowest
C.
when pressure inside the atria is greater than that inside the ventricles
D.
when pressure is greater in the aorta than in the left ventricle
【简答题】No one goes to the school during the v______.
【简答题】两个空气介质平行板电容器C1和C2,若两极板正对面积之比为3:2,两极板间距离之比为3:1,则它们的电容量之比为 。若C1为6μF,则C2 = μF
【单选题】------ How was your trip to Yungang Caves during your National Day holiday? -------- Wonderfully! I’ve never had _______ one before．
A.
a pleasant
B.
a more pleasant
C.
a most pleasant
D.
the most pleasant
【简答题】两个电容器C1=6μF,C2=3μF,若将这两个电容器串联,则总电容为_____________μF;若将这两个电容并联则总电容为_____________μF。
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