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WHO在《关于身体活动有益健康的全球建议》中推荐：成年人应每周至少完成150分钟中等强度有氧身体活动,或每周累计至少75分钟高强度有氧身体活动,或中等和高强度两种活动相当量的组合。
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正确
B.
错误
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【单选题】《红楼梦》中,“刘姥姥进大观园”,这在今天变成了一句俗语——大开眼界。按照曹雪芹的构思,刘姥姥进荣国府,一共进了几次?
A.
2
B.
3
C.
4
D.
5
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【单选题】电源电路中滤波的作用是（）
A.
将正弦波变方波
B.
将交流电变直流电
C.
将高频信号变成低频信号
D.
使脉动直流电压变为平滑的直流电压
查看完整题目与答案
【简答题】滤波的作用是将 直流电变为 直流电。
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【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】直流稳压电源电路中,滤波的作用是()。
A.
降低电网电压的有效值.
B.
将交流变为直流.
C.
将整流后的脉动直流中的谐波分量滤掉，使波动变平滑.
D.
将较平缓的直流变为稳定的直流.
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几进大观园?
A.
二次
B.
三次
C.
四次
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几次进大观园
A.
1次
B.
2次
C.
3次
D.
4次
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate science
B.
science affects almost every aspect of our life
C.
scientists live in a specific substructure
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】铅中毒问题中,模型所涉及的变量为( ) .
A.
组织、血液、舌头
B.
组织、血液、骨头
C.
组织、血液
D.
血液、骨头
查看完整题目与答案
相关题目：
【单选题】《红楼梦》中,“刘姥姥进大观园”,这在今天变成了一句俗语——大开眼界。按照曹雪芹的构思,刘姥姥进荣国府,一共进了几次?
A.
2
B.
3
C.
4
D.
5
查看完整题目与答案
【单选题】电源电路中滤波的作用是（）
A.
将正弦波变方波
B.
将交流电变直流电
C.
将高频信号变成低频信号
D.
使脉动直流电压变为平滑的直流电压
查看完整题目与答案
【简答题】滤波的作用是将 直流电变为 直流电。
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
查看完整题目与答案
【单选题】直流稳压电源电路中,滤波的作用是()。
A.
降低电网电压的有效值.
B.
将交流变为直流.
C.
将整流后的脉动直流中的谐波分量滤掉，使波动变平滑.
D.
将较平缓的直流变为稳定的直流.
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几进大观园?
A.
二次
B.
三次
C.
四次
查看完整题目与答案
【单选题】《红楼梦》中,刘姥姥几次进大观园
A.
1次
B.
2次
C.
3次
D.
4次
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate science
B.
science affects almost every aspect of our life
C.
scientists live in a specific substructure
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
查看完整题目与答案
【单选题】铅中毒问题中,模型所涉及的变量为( ) .
A.
组织、血液、舌头
B.
组织、血液、骨头
C.
组织、血液
D.
血液、骨头
查看完整题目与答案