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A.Algebra and math. B.English-language arts and mathematics. C.Math and

Algebra and math.
B. English-language arts and mathematics.
C. Math and reading.
D. English and reading.

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5，10，20，30，()

A. 40
B. 45
C. 50
D. 60

A.Study for some profession.B.Attend a medical school. C.Stay in busines

A. Study for some profession.
B. Attend a medical school.
C. Stay in business.
D. Sell his shop.

固定收入型基金的主要投资对象是基金和优先股。（）

如图9-2所示，已知 v_A＝ω₁·O₁A，方向如图；v_D垂直于O₂D。于是可确定速度瞬心C的位置，求得：
这样做对吗？为什么？