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【多选题】
下列关于中华民族勤劳勇敢的正确说法有()A.
勇敢是广为推崇褒扬的美德,它要求人们无论是遭遇险风恶浪,还是面对残暴权势,都要有无所畏惧的精神
B.
中华民族是勤于劳动、善于创造的民族。
C.
勤劳是一切事业成功的保证,是立国之本。
D.
勤劳勇敢是中华民族创造一个又一个人间奇迹的重要精神动力。
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举一反三
【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
【简答题】滤波的作用是将 直流电变为 直流电。
【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
【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.
【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
【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
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