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【单选题】
Domestic water pump is started automatically by a______ which operates as the water level falls to a predetermined level.A.
level controller
B.
temperature switch
C.
floating ball
D.
pressure switch
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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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