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【单选题】
对运输问题，下列说法正确的是：（）A.
运输问题求解思想与单纯型法截然不同
B.
运输问题中的产地的产量之和与销地的销量之和一定相等
C.
产地数与销地数相等的运输问题是产销平衡运输问题
D.
运输问题要实现最小化，故检验数要满足非负，才获得最优调运方案
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反馈参考答案：
举一反三
【单选题】--- Joan, what_________in your hand? --- Look! It's a birthday gift for my grandmother.
A.
had you held
B.
are you holding
C.
do you hold
D.
will you hold
【单选题】My grandmother had________ over 50, 000 when she was sixty- five years old.
A.
put away
B.
put back
C.
put out
D.
put down.
【简答题】My grandmother had a 1———— for the sun, a holy regard that now is all but gone out of mankind. There was a 2———— in her, and an ancient awe. She was a Christian in her later years, but she had come a ...
【单选题】Life was extremely hard in the past. My grandmother had no chance to go to school, even the ______ school.
A.
elemental
B.
elementary
C.
basic
D.
introductory
【单选题】中性点不接地系统的主要优点是
A.
发生单相接地时仍可继续向用户供电
B.
接地电流较大时,不会在接地点产生断续电弧
C.
接地电流较大时,不会使线路发生谐振过电压现象
D.
发生单相过电压时,不会继续向用户供电
【单选题】It’s true that the bad news had a bad ______ on my grandmother.
A.
affect
B.
instance
C.
taste
D.
Effect
【简答题】When my grandmother was raising me in Stamps, Arkansas, she had a particular routine（惯例）when people who were known to be whiners entered her store. My grandmother would ask the customer, “How are you ...
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