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【单选题】
关于求和运算电路,下列说法错误的是( )。A.
所有输入信号均作用于集成运放同一个输入端，则实现加法运算。
B.
所有输入信号不全部作用于集成运放同一个输入端，则实现减法运算。
C.
所有输入信号均作用于集成运放同一个输入端，则实现减法运算。
D.
使用单个集成运放构成加减运算电路的缺点是电阻的选取和调整不方便。
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举一反三
【单选题】As for air quality indoors, Australians suffer a higher concentration of pollutants than people in other regions.
A.
Y
B.
N
C.
NG
【单选题】The higher the cetane number, _____ the ignition quality of the fuel.
A.
the worse
B.
the better
C.
the smaller
D.
the greater
【单选题】With economy increasing steadily, people ______ enjoy a life of higher quality.
A.
should
B.
can
C.
may
D.
must
【单选题】Fuels of high quality with their earlier ignitions will cause higher _____ pressure in cylinders of a diesel engine.
A.
compression
B.
maximum
C.
rated
D.
oil
【简答题】在入栈时,应先判别栈是否为____;在出栈时,应先判别栈是否为____。
【多选题】What quality issues differentiate higher-quality watches from lower-quality ones? Higher quality watches _________.
A.
keep good time
B.
are resistant to water and shocks
C.
are made from more expensive, better-looking materials
D.
are made from non-metallic alloy.
【单选题】In author's opinion, the sudden appearance of higher-quality goods suggests its officials ______.
A.
become more concerned about the quality and domestic market
B.
turn to other ways to stimulate and enforce export rules
C.
have to improve goods' quality for the qualification of exports
D.
want consumers to buy better products at low prices
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