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【简答题】
证券投资基金本身是一个资产组合。（ ）
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【单选题】An uniform thin rod OA is pivoted on a frictionless hinge at one end O, as shown in the figure. The rod is held at rest horizontally and then released. When it reaches the vertical position which one ...
A.
Angular velocity varies from small to big, angular acceleration remains unchanged;
B.
Bothe angular velocity and angular acceleration vary from small to big;
C.
Angular velocity varies from small to big, while angular acceleration varies from big to small;
D.
Angular velocity remains unchanged , angular acceleration equals zero.
【单选题】An uniform thin rod OA is pivoted on a frictionless hinge at one end O, as shown in Fig. The rod is held at rest horizontally and then released. When it reaches the vertical position which one is corr...
A.
Angular velocity varies from small to big, angular acceleration remains unchanged;
B.
Both angular velocity and angular acceleration vary from small to big;
C.
Angular velocity varies from small to big, while angular acceleration varies from big to small;
D.
Angular velocity remains unchanged, angular acceleration equals zero.
【简答题】A thin rod is uniformly charged (Q, L). How much is the electric potential for point P in the figure? (3 significant numbers)【图片】【图片】
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【简答题】谷类及豆类种子含水量一般为______;鱼类为______。
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