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【简答题】
先化简,再求值:(a﹣2b)(a+2b)+ab 3 ÷(﹣ab),其中a= ,b=﹣1.
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参考答案:
举一反三
【判断题】技术标准层是智能物流广泛应用的必要条件
A.
正确
B.
错误
【多选题】提高汽车空气洁净度有哪些方法?
A.
喷水蒸汽
B.
安装负离子发生机
C.
引入外界新鲜空气
D.
放置活性炭
【简答题】(英译汉) I have seen your home-textiles in the Canton Fair and they are fine in workmanship and re a son a ble in prices. Please send me a copy of your catalogue. I am particularly interested in your pro...
【单选题】—_____ are your father and mother ? —They are fine.
A.
What
B.
How
C.
Who
D.
How old
【单选题】Peter: Hi, Jack, _______?
A.
and you
B.
how is your family
C.
how are you
【简答题】As many as 10 of the 17 kinds of penguins may be in er of disappearing. The number of penguins have decreased by 30% since 1987. Penguins are black and white birds that live in the southern part o...
【单选题】设随机变量X与Y的方差均存在且不为0,若E(XY)=EXEY,则( ).
A.
X与Y一定独立
B.
X与Y一定不相关
C.
D(XY)=DXDY
D.
D(X-Y)=DX-DY
【简答题】How_________your Parents? They are fine. Thank you. (be)
【单选题】—_________ are they? —They are fine. [     ]
A.
Where
B.
What
C.
Who
D.
How
【简答题】培育速生丰产林应满足什么条件?
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