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（2011?黑河）已知直线y= x+4 与x轴、y轴分别交于A、B两点，∠ABC=60°，BC与x轴交于点C． （1）试确定直线BC的解析式． （2）若动点P从A点出发沿ACC运动（不与A、C重合），同时动点Q从C点出发沿CBAA运动（不与C、A重合），动点P的运动速度是每秒1个单位长度，动点Q的运动速度是每秒2个单位长度．设△APQ的面积为S，P点的运动时间为t秒，求S与t的函数关系式，并写出自变量的取值范围． （3）在（2）的条件下，当△APQ的面积最大时，y轴上有一点M，平面内是否存在一点N，使以A、Q、M、N为顶点的四边形为菱形？若存在，请直接写出N点的坐标；若不存在，请说明理由．
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Five steps of designing a computer game.
B.
Smoking should be allowed at home.
C.
Brief comment on receiving first prize
D.
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A.
comment favorably on improvements over their previous work
B.
make sure his students hand in something above their usual standard
C.
write a brief comment in the margin to please them
D.
show his students that he is aware they are eager to be praised
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A.
brief comment on opposing argument
B.
attention getter
C.
expansion
D.
rebuttal
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A.
present a brief introduction to Shakespeare
B.
comment on Shakespeare contribution
C.
appreciate Shakespeare's works
D.
discuss Shakespeare's writing style
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A.
announcing the clash point
B.
describing the opposing argument
C.
brief comment
D.
a transitional device
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A.
正确
B.
错误
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【多选题】What will be included in a reply to the first order? 回复首次订单的信函中应包含以下哪些内容?
A.
Express pleasure at receiving the order
B.
Add a favorable comment on the goods ordered
C.
Include an assurance of prompt and careful attention
D.
Draw attention to other products likely to be of interest
E.
Ask for catalogues and samples
F.
Hope for further orders
G.
Enquire for specific products
H.
Give a brief introduction of your company
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【单选题】硬脂酸镁在制备片剂中的作用主要是:
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吸收剂
B.
崩解剂
C.
润滑剂
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粘合剂
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【单选题】Which of the following topic can be used to conduct an informative speech?
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Brief comment on receiving first prize
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【单选题】According to one teacher, rather than drown students' compositions in critical red ink, the teacher should__________.
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【多选题】the substantiation of the DPM or the DLO's speech comprises ____ and _____.
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【单选题】The passage aims to______.
A.
present a brief introduction to Shakespeare
B.
comment on Shakespeare contribution
C.
appreciate Shakespeare's works
D.
discuss Shakespeare's writing style
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A.
announcing the clash point
B.
describing the opposing argument
C.
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D.
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【判断题】急性上呼吸道感染多数需要使用抗生素治疗
A.
正确
B.
错误
查看完整题目与答案
【多选题】What will be included in a reply to the first order? 回复首次订单的信函中应包含以下哪些内容?
A.
Express pleasure at receiving the order
B.
Add a favorable comment on the goods ordered
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Include an assurance of prompt and careful attention
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Draw attention to other products likely to be of interest
E.
Ask for catalogues and samples
F.
Hope for further orders
G.
Enquire for specific products
H.
Give a brief introduction of your company
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【单选题】硬脂酸镁在制备片剂中的作用主要是:
A.
吸收剂
B.
崩解剂
C.
润滑剂
D.
粘合剂
查看完整题目与答案
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