火车从甲站到乙站的正常行驶速度是16m/s，有一次火车从甲站开出_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题计算题

火车从甲站到乙站的正常行驶速度是16m/s，有一次火车从甲站开出，由于迟开了300s，司机把速度提高到72km/h才刚好正点到达乙站，求：甲、乙两站的距离是多少？

答案

S=24km

完形填空

The word “sharp” can be __ to describe many different things in your home, classroom, and places of work. In this chapter, the writer __sharp pencils, meaning pencils with a very fine __.The writer does not like dull pencils. 。
We can also use “sharp” to describe the blades of knives. Knives also have points. We can use “sharp” to describe a __ kind of point, such as the sharp points of kitchen and steak knives. Scissors have blades, too, and we can describe these blades as sharp or dull. Furthermore, the points of scissors are __ sharp or rounded spending on the kind of scissors. Some tools, such as saws, scrapers, and garden tools, also have blades. We can use the words “sharp” and “dull” to describe the blades of these tools, too. Sharp knives, scissors, and tools are__to use. They cut things easily and quickly, without effort.
“Sharp” can be used to describe the edges of furniture and __some containers. For example, the edge of a table or desk can be __.In addition; we can describe the edge of __ open can as sharp. The top of a can is sometimes sharp__ to cut your hand. A piece of __ from a broken jar or bottle is ordinarily very sharp.
__we sometimes use “sharp” to describe people. A person who appears sharp is very well __.A person who is sharp, on the other hand, is intelligent, smart, and__ learn and understand.
To summarize, “sharp” can be used to describe many kinds of __ that have blades, points, and edges. When we used it to describe people, it can mean nice looking, well dressed, or intelligent. It is an expensive word because it can be used in many different ways.

A．talks about

B．takes care of

C．doesn't like to mention

D．makes up his mind to

C．interesting

C．information

D．In this way

A．funny things

单项选择题

WHO推荐的EF正常值是（）

A.LVEF>50%，RVEF>40%

B.LVEF>40%，RVEF>50%

C.LVEF>55%，RVEF>55%

D.LVEF>45%，RVEF>45%

E.LVEF>50%，RVEF>50%