正常人的心跳频率为每分钟60~100次,请问怎样的心跳频率更长寿?()A.偏快的心跳

题型:单项选择题

问题:

正常人的心跳频率为每分钟60~100次,请问怎样的心跳频率更长寿?()

A.偏快的心跳

B.偏慢的心跳

C.寿命与心跳快慢毫无关系

考点:自然科学知识竞赛生物知识竞赛生物知识竞赛题库
题型:单项选择题

An Indian anthropologist, Chandra Thapar, made a study of foreign cultures, which had customs similar to (91) of his native land. One culture in (92) fascinated him because it reveres one animal (93) sacred, much as the people in India (94) the cow. The things he discovered might interest you (95) you will be studying India as part of this course.
The tribe Dr. Thapar (96) is called the Asu and is found on the American continent north of the Tamhumara of Mexico. Though it seems to be a (97) developed society of its type, it has an overwhelming (98) with the care and feeding of the rac—an animal much like a bull in size, strength and temperament. In the Asu tribe, it is almost a social (99) to own at least one (100) not more rats. People not possessing at least one are (101) in low esteem by the community because they are too poor to (102) one of these beasts properly. Some members of the tribe, to (103) their wealth and social prestige, even own (104) of racs.
(105) the rac breed is not very healthy and usually does not live more than five to seven years. Each family invests large (106) of money each year to keep its rac healthy and shod, for it has a tendency to throw its shoes often. There are rac (107) in each community, perhaps more than one if the community is particularly (108) . These specialists, however, due to the long period of ritual training they must undergo and (109) the difficulty of obtaining the right selection of charms to treat the rac, demand (110) offerings whenever a family must treat an ailing rac.

A.those

B.that

C.it

D.them

题型:单项选择题

有关城市功能区的正确叙述是         

①每种功能区以一种功能为主,无其他功能 ②同类活动空间上高度聚集,形成了功能区 ③一个城市通常只有一个工业区 

④商业区的区位需求便捷的交通条件

A.①②

B.③④

C.②④

D.①③

题型:单项选择题

亮度通道

题型:单项选择题

下列各波函数不合理的是:()

A.ψ(1,1,0)

B.ψ(2,1,0)

C.ψ(3,2,0)

D.ψ(5,3,0)

题型:单项选择题

自动线所属各机床及部件的装配要求与单台组合机床的装配要求是一样的。( )

更多题库