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【单选题】
下面对骨细胞的描述,哪项错误A.
相邻细胞的突起间有缝隙连接
B.
有一定的溶骨和成骨作用
C.
骨陷窝和骨小管内含组织液
D.
在骨板内，骨板间则无
E.
前体是成骨细胞
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举一反三
【单选题】It can be inferred from the passage that the Puritans were ______.
A.
uneducated
B.
hardworking
C.
generous
D.
wealthy
【简答题】如图所示底层给排水平面图 从底层给排水平面图可以看出,图中粗虚线表示 ,空心圆圈表示 。室外南侧两个圆圈表示 。 第2号排污系统有 引向室外检查井。 a. 第一根排出管将厨房 洗涤池 的污水,排至排水 ,再沿 直接排入室外检查井。 b. 另一根排出管将卫生间的洗衣盆、地漏、坐便器和浴盆的污水通过排出横管排入立管 ,沿排出管汇入室外检查井。
【单选题】So too did a lot of the norths soldiers. One of the central themes of the political history of the twelfth century was the continual effort by the northern kingdoms to extend their control southward i...
A.
To highlight the difference between the views of various ecologists about the nature of ecological communities
B.
To illustrate why some ecologists tended to view ecological communities as highly integrated
C.
To demonstrate that one forest has a greater variety of species than the other
D.
To show how these two forests differ from others in the United States
【单选题】The central themes in Harry Potter always involve tolerance of other people and _________.
A.
reliance on community
B.
self-reliance
C.
independence
D.
altruism
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