由0,1,2,3,4组成的四位数中,出现含有数字0,且恰有2个数位上的数字重复的

题型:填空题

问题:

由0,1,2,3,4组成的四位数中,出现含有数字0,且恰有2个数位上的数字重复的四位数的概率是___________。

考点:随机事件及其概率
题型:填空题

一轮船以一定的速度,船头垂直河岸向对岸行驶,河水匀速流动(河道是直的),如图轮船渡河通过的路径和所用时间与水流速度的关系是:   (   )

A.水流速度越大,则路程越长,所用时间也越长。

B.水流速度越大,则路程越短,所用时间也越短。

C.水流速度越大,路程和时间均不变。

D.水流速度越大,路程越长,但所用的时间不变。

题型:填空题

食管胃底的曲张静脉出血,一次出血量达

A.200~300ml

B.100ml以内少量出血

C.1000ml以上

D.500~1000ml

E.500ml

题型:填空题

When I was young, my parents ran a snack bar in our small town.

One evening in early April, my mother told me to fill in at the snack bar (1) a worker who had the flu. I told her I would mess it up, (2) I had never worked at the bar before. I (3) that instead of making money, I would end up owing it.

"You can do it, " said my mother, " (4) , you won’t get much business until lunch. "

"But I’ll never remember the orders, and I’m no good (5) money. Please, Mom, don’t (6) me. "

"Then I’ll help you", she said.

I shrugged my shoulders. I thought my mother’s (7) was a bad one, but I (8) .

When I got to the bar the next day, I found my mother was (9) . Because the weather that day was rainy and cold, people wanted hot snacks and drinks. (10) , I was really slow at taking the orders and making change. The line of people grew, and everybody seemed (11) , I was so nervous that my hands shook, and I (12) a cup into pieces. What a mess! Then my mother came to (13) me, and she also showed me how to make (14) If someone gave me $ 5 for something that cost $ 3.25, I handed over (15) quarters and a dollar and said, "75 cents makes four dollars, plus one dollar makes five. " Things went more (16) after that.

By the end of the day, I could remember orders, (17) the bill, and make change quickly with a smile. I was even a little (18) when the sun came out and dried up business. My mother said she was proud of me, and when she (19) that I work at the snack bar again next year, I did not even shrug. I was too busy (20) the restaurant I would open one day.

12()。

A. damaged

B. destroyed

C. broke

D. ruined

题型:填空题

营销渠道通过创造(),完成与产品转移有关的一系列活动。

A.形式效用

B.所有权效用

C.时间效用

D.地点效用

题型:填空题

频谱多普勒技术可以用来测量多种数据,下列哪一种数据是不能测量的:

A.收缩期血流速度

B.搏动指数(PI)

C.阻力指数(RI)

D.血流平均速度(Vm)

E.血管的内径

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