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【单选题】
把目标函数化为典则形式后,基变量在目标函数中的系数为 ( )A.
1
B.
0
C.
很大的正数
D.
很小的负数
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Mary found it (difficult) to talk (calmly) about (which) she had (experienced) at the station.
A.
difficult
B.
calmly
C.
which
D.
experienced
【单选题】Mary found____extrerhely difficult to pass the examination.
A.
it
B.
this
C.
that
D.
what
【单选题】As a result of their experiments, Dr. Corsi's team found that ______.
A.
dishwashers are very efficient machines.
B.
tap water is as polluted as bottled water.
C.
indoor pollution rivals outdoor pollution.
D.
gas masks are a useful protective device.
【简答题】Mary found it difficult to ________ Jim’s father when he disapproved of their marriage. A) stand for B) stand out C) stand by D) stand up to
【单选题】Not until the train pulled into the next station _____ her suitcase gone. [ ]
A.
Mary had found
B.
had Mary found
C.
did Mary find
D.
Mary found
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