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【判断题】
随机变量方差的大小可以刻画该随机变量取值偏离其均值的分散程度。A.
正确
B.
错误
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【简答题】请完成 第五章 功能原理与机械能守恒定律 课后习题 奇数题
【单选题】It can be inferred from the researchers first finding that______.
A.
the experiment did not make sense
B.
volunteers' feelings varied from one to another
C.
researchers found out why musical senses may assess smell
D.
human brains combine multisensory information to make sense
【单选题】According to the interviewee, what is the problem with the research?
A.
The researchers can't explain what leads to the finding.
B.
Researchers only do the tests on one kind of bacteria.
C.
The research is still in the stage of controlled lab tests.
D.
There are still some flaws in the procedure of the research.
【简答题】制动防抱死装置故障的初步检查包括哪些内容?
【单选题】We can infer from the word 'ideal' in the last paragraph that ______.
A.
researchers' design is too unrealistic
B.
everyone dreams an ideal world they can test
C.
people over 15 receiving tests once a year is just what researchers conceived
D.
it is impossible for everyone over 15 to test once a year
【单选题】Brain researchers have discovered that the formation of new habits can be ______.
A.
predicted
B.
regulated
C.
traced
D.
guided
【单选题】Researchers at the University of Illinois determined that the ______ of a father can help improve a child's grades.
A.
involvement
B.
communication
C.
interaction
D.
association
【单选题】How can researchers in 'sleep laboratories' tell that the animals they are observing are asleep or not?
A.
They see if the animals respond to light and sound.
B.
They do this by observing changes in the animals' brain signals, breathing, heartbeat, and muscle activity.
C.
They see if the animals' eyes are closed.
D.
They can tell this by seeing if the animals lie down or not.
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