对于分析高温管道及铸铁的组织性能具有重要意义的是（）体。 A.珠光 B.渗碳 C.莱

There is an English saying : “ ___小题1:____”. Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body.____小题2:___.

Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. ___小题3:____ . If laughter exercises the body, it must be beneficial.

Other tests have shown that laughter appears to be able to reduce the effect of pain in groups of students who listened to different radio programs. The group that tolerated (忍耐) the pain for the longest time was the group which listened to a funny program. __小题4:___ .

____小题5:____ . They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.

A．Laughter can prolong one’s life.

B．As a result of these discoveries, some doctors in the United State now hold laughter clinics in which they help to improve their patients’ condition by encouraging them to laugh

C．The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain

D．It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach and even the feet. E. Although laughter helps cure the disease, doctors still can not put this theory into clinic practice.

F. laughter is the best medicine

G. They have found that laughter really can improve people’s health

1999年7月，北京市某中学教师14人参加某旅行社组织的云南旅游团，黄某为该团导游。时至出发日，黄某发现7位教师携带孩子同赴云南，即向旅行社报告并要求他们增交旅游费用。该7位教师增交了交通、餐费300元/人。该团至世博游览时，黄某请7位教师另付孩子门票50元/人。该7位教师坚持不另付门票。由此发生争执。一位教师拨打了 110报警。警方将黄某带离现场询问后又送回。黄某对教师的行为十分恼火，遂向旅行社请示，不愿继续带此团。经旅行社同意，黄某请地接负责关照此团后，返回北京。该旅游团如期返京后投诉，认为黄某擅自弃团，属中止导游活动，要求处罚黄某并退赔旅行费用及经济损失。请问：
(1)何为中止导游活动黄某的行为是否属于中止导游活动为什么
(2)根据《旅行社质量保证金额赔偿试行标准》的规定，旅行社是否应退赔旅行费用并赔偿经济损失为什么

反击式碎煤机运行中机内有异常响声的原因和处理方法是什么？

我国古代房屋建筑理念取自于《周易·系辞》中的（）

A.大壮

B.大过

C.小过

按文件的内容划分有( )。

A．顺序文件和随机文件

B．ASCII文件和二进制文件

C．程序文件和数据文件

D．磁盘文件和打印文件