烧伤患者出现血红蛋白尿时，治疗中要求其每小时尿量保证在（） A.50ml以上 B.4

一辆质量为M的超重车，行驶上半径为R的圆弧形拱桥顶点，已知此处桥面能承受的最大压力不超过车重的3/4倍，要使车能安全沿桥面行驶，求在此处车的速度应在什么范围内？重力加速度为g

描述 CH₃－CH＝CH－C≡C－CF₃分子结构的下列叙述中，正确的是

A．6个碳原子有可能都在一条直线上

B．6个碳原子不可能都在一条直线上

C．6个碳原子不可能都在同一平面上

D．所有原子有可能都在同一平面上

All over Britain there are ruins of castles that reflect their entire past. Over the years, legends have focused on these castles.

Castell Coch

This castle was built in the 1870's. Lfor Bach was once the owner of this castle many decades ago, and it is told that he hid a treasure in the nearby tunnel（地道）. Rumors say that it is guarded by three eagles waiting for Lfor to return to collect his treasure.

Luffness Castle

In the basement(地下室) of this castle is a huge door leading to a room. The family kept this door open at all times, but one day the door was found locked and the key was missing. The whole family was surprised. The door was so big that it could not be broken down. One day the son of the family shone of a torch the door. He discovered that the key was on the inside of the room. To this day the door remains locked from the inside.

Toddington Castle

　　This castle was built during the 13th century. This castle has a local legend that tells about a witch who was put in prison within the castle and died. It is told that her spirit remains and if you put your ear to the floor at Easter, you can hear her cooking below.

Castell Gwynionydd

A legend rests on this castle that states the devil(魔鬼) was the one who built it. It is said the devil had a problem with some people and had planned on punishing them. On his way, the devil met a cobbler（修鞋匠）.The cobbler pointed out that it was still a reasonable distance until he would reach his destination. The cobbler displayed how many shoes he had worn out. Listening to him, the devil did not think his plan was worth so much effort and gave up his plan.

50．Which of the castles mentioned in the passage is said to be guarded by several birds?

A．Castell Coch.          B．Luffness Castle.      

C．Toddington Castle.   D．Castell Gwynionydd.

51．Which of the following castles is related to the legend about a witch?

A．Castell Coch.         

B．Luffness Castle.      

C．Toddington Castle.  

D．Castell Gwynionydd.

52．We can learn from the passage that          .

A．Castell Coch is said to be built by the devil

B．Castell Gwynionydd is a great place to celebrate Easter

C．Luffness Castle was once broken down

D．Toddington Castle dates back to the 13 th century

镶贴

计算机软件分系统软件和应用软件两大类，其中系统软件的核心是（）。

A.数据库管理系统

B.操作系统

C.程序语言系统

D.财务管理系统