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【简答题】
对某电压信号进行四进制数字化，该电压信号在【-5V,+5V】之间，现有一抽样值电压为+3V，请问编码为什么？
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反馈参考答案：
举一反三
【单选题】Sixty percent of the work______ .
A.
have been done
B.
had been done
C.
has been done
D.
has done
【简答题】Does Lu Hua live on the old campus or the new campus?
【简答题】离心泵的叶轮有 ( ) 、 ( ) 和开敞式 三种形式。
【单选题】Over sixty percent of the church______destroyed during a bomb (炸弹) attack in the second World War.
A.
have been
B.
has been
C.
was
D.
were
【简答题】离心泵的叶轮有封闭式、半封闭式和（）三种形式。
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