(9分)小明利用如图所示的滑轮组将重为900N的物体匀速提升,所用的拉力为360

题型:计算题

问题:

(9分)小明利用如图所示的滑轮组将重为900N的物体匀速提升,所用的拉力为360N,物体被提升的高度为1m。求:(1) 所做有用功是多少; (2) 小明做的总功是多少;(3) 滑轮组的机械效率是多少;

 

考点:机械效率的计算
题型:计算题

Today I took Frank to have a training class (培训课). We got there earlier than most of the other dogs and owners.

Mr. Brown helped us teach our dogs some skills (本领). When the dog did it, he said, “Good dog!” He was a serious man but he laughed a lot with dogs. He said Frank was smarter than other dogs.

Next to Frank was also a smart dog. His name was Sam. His short legs made him look funny, but he could run faster than many of the bigger dogs. His owner was a quiet girl and looked a little shy. So I said hello to her first. I hoped she could be my friend.

At the end of the class, Mr. Brown told me that Frank did the best this class and he would give him a ball.

小题1: The meaning (意思) of the underlined word “owner” is    .

A.兽医

B.主人

C.指挥

D.导师小题2: Who is Frank?

A.He’s a dog.

B.She’s a shy girl.

C.He’s a quiet boy.

D.She’s a teacher.小题3: What did Mr. Brown do during the class?

A.He taught dogs some skills.

B.He fed dogs.

C.He gave dogs balls.

D.He talked with dogs.小题4:What did Mr. Brown think of Frank?

A.Frank was serious.

B.Frank was outgoing.

C.Frank was funny.

D.Frank was smart.小题5:Which of the following is NOT true?

A.Sam ran faster than some bigger dogs.

B.Sam was next to Frank.

C.Frank arrived later than most of the other dogs.

D.Frank did the best in class.

题型:计算题

黑膏药属于哪种剂型

A.软膏剂

B.铅硬膏

C.橡胶硬膏

D.树脂硬膏

E.乳膏

题型:计算题

下列关于生态系统的叙述,正确的是()。

A.生态系统中生产者一定是绿色植物

B.没有分解者的生态系统,通过自我调节也可以维持生态系统的稳定性

C.在生态系统的食物链中.营养级越高的生物体型也越大

D.生态系统的能量流动是伴随物质循环而进行的

题型:计算题

当坝坡或沉积滩面出现塌陷时,可用()袋装粗砂和碎石混合料堆放在塌陷坑内,自行下沉,最终自然堵塞漏矿点

A、帆布

B、麻布

C、土工布

题型:计算题

甲公司2000年实现净利润400 000元,1999年12月31日的未分配利润为50 000元,
2001年2月5日经董事会批准按以下分配方案分配。
(1)按净利润的10%提取法定盈余公积。
(2)按净利润的5%提取法定公益金。
(3)分配给普通股股东现金股利100 000元。
(4)分配股票股利100 000元。
上述利润分配方案于2001年5月1日经股东大会批准实施。
要求:根据上述利润分配情况,编制相关利润分配的会计分录。

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