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【判断题】
完全竞争厂商面临的价格和边际成本相等。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】What did the girls tell the teacher for being late?
A.
They got up late.
B.
They could not get a taxi.
C.
Their taxi had a flat tire.
【单选题】如图 1 ( a )、( b )所示为甲、乙两辆电动小车作匀速直线运动的 s - t 图像,比较两车运动的快慢,则
A.
甲车运动一定快
B.
乙车运动一定快
C.
乙车运动可能快
D.
甲、乙车运动快慢相同
【单选题】—I have difficulty learning English_______. —You may read after the tapes or ask the teacher for help. [ ]
A.
grammar
B.
pronunciation
C.
rules
D.
books
【单选题】how to work out the difficult physics problem ,he asked the teacher for help .
A.
Not to know
B.
Not knowing
C.
Knowing not
D.
Not known
【单选题】— _do you study for your math test? —By working with my classmates or asking the teacher for help. [ ]
A.
How
B.
What
C.
When
D.
Why
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