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已知抛物线C：y 2 =2px（p＞0），其焦点是椭圆mx 2 +4y 2 =1的右焦点，且椭圆的离心率为 2 2 ． （Ⅰ）试求抛物线C的方程； （Ⅱ）在y轴上截距为2的直线l与抛物线C交于M，N两点，以线段MN为直径的圆过原点，求直线l的方程； （Ⅲ）若以原点为圆心，以t（t＞0）为半径的圆分别交抛物线C上半支和y轴正半轴于A，B两点，直线AB与x轴交于点Q，试用A点的横坐标x 0 表示点Q的坐标．
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A.
they encourage the employees to move forward
B.
they are affected by many factors.
C.
they can not become desirable enough
D.
t hey can not become mature enough
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A.
a challenging and exciting environment
B.
a frustrating and changing environment
C.
a cooperative and creative environment
D.
a positive and productive environment
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【单选题】关于获得性膜，下列说法错误的是
A.
是细菌附着牙釉质表面的必需条件
B.
具有选择性吸附能力
C.
由菌斑微生物所分泌
D.
乃菌斑形成初始，在牙面上覆盖的一层均匀无细胞的薄膜
E.
来自唾液糖蛋白结构
【简答题】展览业属于第( )产业中的( )业。
【多选题】下列关于细菌附着的说法,正确的有( )
A.
牙面获得性膜形成后，很快便有细菌附着
B.
最先附着的细菌为球菌
C.
口腔链球菌的附着开始是非特异性、低亲和力、非常迅速的结合反应，继之才是特异性、高亲和力、缓慢的附着
D.
在蔗糖诱导菌斑形成过程中葡糖基转移酶起到关键作用
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A.
support the individual ’ s career development.
B.
help the employees live more wealthily
C.
develop its own culture
D.
change its culture regularly
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