已知球的直径为d,求其内接正四棱柱体积的最大值以及此时正四棱柱的高。

题型:解答题

问题:

已知球的直径为d,求其内接正四棱柱体积的最大值以及此时正四棱柱的高。

考点:函数的最值与导数的关系柱体、椎体、台体的表面积与体积
题型:解答题

阅读理解。

     This is a picture of a classroom(教室). The classroom is big and clean(干净). You can see a

teacher's desk, five desks and six chairs. You can see a girl and a boy.

    Three books are on the teacher's desk. A pencil case is on a desk. Two pens and two rulers are in

the pencil case. A schoolbag is behind a chair. A ball is on the floor.

    The girl is Lucy. She is eleven. The boy is Mike. He is twelve. They are good friends. Their teacher

is Miss Green. She is not here.

1. How many(多少) desks are there in the classroom?

    ______________________________________.

2. Where are the two pens?

   _______________________________________.

3. Is the ball on the desk?

   _______________________________________.

4. Are Mike and Lucy good friends?

                                                                 _______ .

5. Who is their(他们的) teacher?

  _______________________________________.  

题型:解答题

小区域调查方法有多种,若想了解人们的旅游动机,最经济和适合的调查方法是(  )

A.问卷调查

B.调查访问

C.路线考察

D.旅游景点考察

题型:解答题

动物性食品中的铁比植物性食品中的铁利用率高。

题型:解答题

下列应通过“其他应交款”科目核算的有( )。

A.应付股利

B.应付融资租赁款

C.矿产资源补偿费

D.应付补偿贸易引进设备款

题型:解答题

下列哪部法典包含着两河流域苏美尔法典的精华()

A.《乌尔纳姆法典》

B.《苏美尔法典》

C.《汉穆拉比法典》

D.《苏美尔亲属法》

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