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【简答题】
已知直线l:y=x+2,与抛物线x 2 =y交于A(x A ,y A ),B(x B ,y B )两点,l与x轴交于点C(x C ,0). (1)求证: 1 x A + 1 x B = 1 x C ; (2)求直线l与抛物线所围平面图形的面积; (3)某同学利用TI-Nspire图形计算器作图验证结果时(如图1所示),尝试拖动改变直线l与抛物线的方程,发现 1 x A + 1 x B 与 1 x C 的结果依然相等(如图2、图3所示),你能由此发现出关于抛物线的一般结论,并进行证明吗?
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【判断题】根据盈亏平衡分析得知,公司只有在价格补偿平均变动成本费用之后的累积余额等于全部固定成本费用,或者说销售量超过盈亏平衡点时的销售量才有可能盈利。
A.
正确
B.
错误
【单选题】________ of this term, we will have learnt 4 books.
A.
At the end
B.
By the end
C.
In the end
D.
At an end
【多选题】对于认股权证,下列因素中,在其他因素不变的情况下,与权证价值呈反方向变化的变量有( )。
A.
股票价格
B.
行权价格
C.
到期期限
D.
波动率
E.
无风险利率
【单选题】We can test LANGUAGE (to find out what our students have learnt): Grammar, vocabulary, spelling and _______.
A.
pronunciation
B.
listening
C.
speaking
D.
Writing
【简答题】对于认股权证,下列因素中,在其他因素不变的情况下,与权证价值呈反方向变化的变量有( )。
【单选题】We are going to have fun ____ English together.
A.
to learn
B.
learning
C.
learn
D.
learnt
【单选题】We have learnt a great deal from all the places we ________.
A.
visit
B.
will visit
C.
would visit
D.
have visited
【单选题】—How many English words have you learnt now? —We had learnt over 1,500 English words ___________ the end of last week.
A.
at
B.
in
C.
by
D.
with
【单选题】We spend as much time as we can _____ English.
A.
learn
B.
to learn
C.
learning
D.
have learnt
【单选题】So far,we_______ lots of English words.
A.
will learn
B.
are learning
C.
has learnt
D.
have learnt
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