消化性溃疡发病人有家族聚集现象是由于（）。 A．全家饮食高热量 B．全家都饮酒 C．

小刚为了探究电磁铁的磁性强弱与哪些因素有关，做了以下几次实验，实验现象如图所示。根据图示现象回答下列问题：

（1 ）实验a 与实验b 相比较说明                                          。

（2 ）实验b 与实验c 相比较说明                                          。

（3 ）小刚根据实验d 中甲、乙两电磁铁出现的现象判断：外形相同的螺线管，线圈的匝数越多，它的磁性就越强。你认为这个结论__________ （选填“全面”或“不全面”），若不全面应补充_________________ 。

Marjorie Gestring

Marjorie Gestring was a springboard（跳板） diver from the United States who won the gold medal in 3-meter springboard diving at the 1936 Summer Olympics in Berlin, Germany at the age of 13 years．With the cancellation（取消） of the Olympics in 1940 and 1944 because of World War II, Gestring did not get a chance to defend her title, and her comeback attempt for the 1948 Summer Olympics failed．

Bob Mathias

17-year-old American Bob Mathias won the decathlon（十项全能运动） only four months after taking up the sport．He is the youngest athlete in Olympic history to win a men's track and field event．By the time Mathias retired from decathlon competition in 1952, he had nine victories in nine competitions．He had won two gold medals separately in 1948 and 1952．In 1954 a film about his early life called The Bob Mathias Story was made, in which he and his wife played themselves．

Fu Mingxia

Fu Mingxia was born on August 16, 1978 in Wuhan, Hubei Province．At an early age, her father taught her to swim at a nearby river．She started exercising gymnastics at age 5, soon turning to diving．Fu Mingxia left home at age 9 to train in Beijing．In the 1992 Summer Olympics held in Barcelona, Fu Mingxia became China's youngest Olympic champion ever when she won the 10-meter platform gold at the age of 13．

Ian Thorpe

Ian Thorpe was born on 13 October, 1982．He is a former Australian freestyle swimmer．At the age of 14, he became the youngest male ever to represent Australia．Ian Thorpe, 17 years old, won the gold medal in the 400m freestyle by breaking his own world record in Sydney 2000．He has won five Olympic gold medals．

小题1:How many times has Marjorie Gestring taken part in the Olympic Games?

A．Two．

B．Three．

C．Four．

D．Five．小题2:Which two athletes took part in the Olympics in the same year ?

A．Marjorie Gestring and Fu Mingxia

B．Bob Mathias and Fu Mingxia

C．Marjorie Gestring and Bob Mathias．

D．Bob Mathias and Ian Thorpe．小题3:How long had Fu Mingxia practised diving in Beijing before she won the 10-meter platform gold in the 1992 Summer Olympics?

A．About ten years．

B．About nine years．

C．About five years．

D．About three years．小题4:What is the passage mainly about ?

A．Some young Olympic champions．

B．The history of the Olympic Games．

C．How to train young Olympic athletes．

D．How to prepare for the Olympic Games．

在以下网络应用中，要求带宽最高的应用是（）。

A．可视电话　

B．数字电视　

C．拨号上网　

D．收发邮件

患者男性，42岁。乙型肝炎病史十余年，近来右上腹不适，腹胀。超声表现右叶缩小，左叶增大，肝被膜不光滑，实质回声增粗增强，欠均匀，肝静脉细窄，走行迂曲，管壁不平整。

如果门静脉管腔内充满等至稍强回声栓子，门静脉管壁模糊、显示不良，在栓子内可见不规则，不正常屈曲的动脉血流，最可能是（）。

A.门静脉血栓

B.门静脉瘘

C.门静脉癌栓

D.门静脉血管瘤

E.门静脉瘤

安全规程对导火线的长度有什么规定？