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【单选题】
关于宫颈，下列哪项是错误的（ ）A.
主要由结缔组织构成
B.
宫颈腺体可分泌少量碱性黏液
C.
主韧带是固定宫颈的主要韧带
D.
宫颈管粘膜为单层高柱状上皮
E.
宫颈内口是宫颈癌的好发部位
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【单选题】如下图所示,在光滑的水平面上,质量分别为m1和m2的木块A和B之间用轻弹簧相连,在拉力F作用下,以加速度a做匀加速直线运动,某时刻突然撤去拉力F,此瞬时A和B的加速度为a1和a2,则( )
A.
a1=a2=0
B.
a1=a,a2=0
C.
a1=m1m1+m2a,a2=m2m1+m2a
D.
a1=a,a2=-m1m2a
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