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【单选题】
以下不属于 4岁以后乳牙(牙合)特征的是A.
牙排列不紧密，前牙间隙逐渐形成
B.
牙的切缘及（牙合）面产生显著磨耗
C.
上、下第二乳磨牙的远中面在同一平面上
D.
随下颌升支发育，暂时性深覆（牙合）减小
E.
下颌第二乳磨牙移至上颌第二乳磨牙的稍前方
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【单选题】下列哪个css属性能顾设置盒子边框为上边框10px,下边框为15px,左边框为20px,右边框为20px?( )
A.
border：10px 15px 20px
B.
border：10px 20px 15px
C.
border：10px 20px
D.
border：20px 15px 10px 20PX
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【单选题】The man ______Mary was so tall that she could hardly see the show.
A.
in front of
B.
in the front of
C.
at the back of
D.
at the beginning of
【简答题】A. get the better of B. select C. to date D. extensive E. essential 3.The machine you are to design must be strong, and yet it is important that it should be light. ( ) (2.0分)A. E
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