搜题请搜索小程序“爱下问搜题”
问题 单项选择题

除个别结点外，其余结点只能有1个前驱结点，可有任意多个后继结点，这样的结构为______。

A) 线性结构
B) 树型结构
C) 图形结构
D) 拓扑结构

答案

参考答案：B

解析： 树形结构中根结点没有前驱但可以有无数个后继，中间结点只有一个前驱，可以有无数个后继，叶子结点只有一个前驱，没有后继。

单项选择题

男，60岁。发热、消瘦1年。骨髓象示粒细胞系增生明显活跃，以多颗粒的异常早幼粒细胞为主，占有核细胞的38%。最可能的诊断是（）

A.AML-M1

B.AML-M2

C.AML-M3

D.AML-M4

E.AML-M5
查看答案
填空题

Exercising to music pumps up brain power


If music makes you smarter, and exercise helps brain function, can exercising to music really boost brainpower Some researchers said it can. Volunteers who listened to Vivaldi’s "Four Seasons" while working out on a treadmill did much better on a test of (1) ability than when they exercised without music, a team (2) Ohio State University found.
"Evidence suggests that exercise improves the (3) performance of people with coronary artery (4) ," said psychologist Charles Emery, who led the study.
"And listening to music is (5) to enhance brainpower. We wanted to put the two results together," Emery (6) in a statement.
Writing in the latest issue of the journal Heart & Lung, Emery and (7) said they studied 33 men and women taking (8) in a cardiac rehabilitation program after having bypass (9) , angioplasty or other procedures to treat clogged arteries.
The (10) said they felt better emotionally and mentally after working out (11) or without the music. But their improvement on the (12) fluency test doubled after listening to music on the treadmills.
"Exercise seems to (13) positive changes in the nervous system, and these changes may have a (14) effect on cognitive ability," Emery said.
"Listening to music may (15) cognitive function through different pathways in the brain. The combination of music (16) exercise may stimulate and increase cognitive arousal (17) helping to organize cognitive output."
Emery said he now wanted to (18) people using music of their own choice. "We used the ’Four Seasons’ because of its (19) tempo and positive effects on medical patients in previous (20) ," Emery said. "But given the range of music preferences among patients, it’s especially important to evaluate the influence of other types of music on cognitive outcomes.\
查看答案