简述遗嘱继承与法定继承的区别。

某码头有三个泊位，一个月(30天)内停靠4艘船舶，其中3艘各占用一个泊位，均停泊90小时，装卸65小时，另一艘占用两个泊位，停泊210小时，装卸150小时。

根据上面资料，回答下列问题：

泊位相对作业率为()。

A.0.443

B.0.696

C.0.718

D.0.832

海洋性贫血的诊断包括（）

A.有溶血表现

B.血片可见多量靶形红细胞

C.血清铁和铁饱和度常增高

D.有珠蛋白肽链合成数量异常的证据

E.有家族史

下列肠梗阻的分类，错误的是（）

A.按梗阻的基本原因分为：机械性肠梗阻、动力性肠梗阻、血运性肠梗阻

B.按肠壁有无血运分为：血运性肠梗阻、缺血性肠梗阻

C.按梗阻发生的部位分为；高位肠梗阻、低位肠梗阻

D.按梗阻程度分为：完全性梗阻、不完全性梗阻

E.按起病缓急分为：急性肠梗阻、慢性肠梗阻

         Men usually want to have their own way. They want to think and act as they like. No one, however, can have his own way all the time. A man cannot live in society without considering the interests(利益) of others as well as his own interests. “Society” means a group of people with the same laws and the same way of life. People in society may make their own decisions, but these decisions ought not to be unjust(不公平) or harmful to others. One man’s decisions may so easily harm another person. For example, a motorist may be in a hurry to get to a friend’s house. He sets out, driving at full speed like a competitor in a motor race. There are other vehicles and also pedestrians (行人) on the road. Suddenly there is a crash. There are screams and confusion. One careless motorist has struck another car. The collision(碰撞) has injured two of the passengers and killed the third. Too many road accidents happen through the thoughtlessness of selfish drivers.

We have governments, the police and the law courts to prevent or to punish such criminal acts. But in addition, all men ought to observe certain rules of conduct. Every man ought to behave with consideration for other men. He ought not to steal, cheat, or destroy the property(财产) of others. There is no place of this sort of behavior in a civilized society.

51. A man cannot have his own way all the time because________.

A. he may have no interest in other people

B. he has to share the same interest with the people in the same society

C. his decisions are always unjust            D. his decisions always harm other people

52. According to the passage, people in a civilized society should usually______.

A. be honest to each other                         B. be cautions in doing everything

C. behave in a responsible way                 D. punish criminal acts

53. The purpose of this passage is to_________.

A. tell people how to behave in society  

B. illustrate the importance of laws

C. teach people how to prevent criminal acts

D. persuade people not to make their own decisions

54. It is implied that there will be fewer road accidents if_______.

A. the drivers are more considerate(体贴的) of other people

B. there are fewer cars or walkers in the street

C. the motorists are not always in a hurry

D. the passengers are calm but not confused before the accidents

55. We can draw a conclusion that_______.

A. the government should contribute more efforts

B. the criminals should be more severely punished

C. man should be more strict with himself

D. man should have more and more similar interests

照明开关的安装高度，除拉线开关外，宜为( )m。

A．1.5；
B．1.4；
C．1.3；
D．1.2。