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【单选题】
____包括电控类玩具、电声类玩具、电脑玩具、通讯玩具等。A.
静态玩具
B.
机动玩具
C.
电子玩具
D.
金属玩具。
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Cells providing the second signal for B cell activation are
A.
Th2
B.
Th1
C.
Dendritic cells
D.
Macrophages
E.
CTL
【判断题】The functions of micronutrients include helping the carbohydrates turn into energy in our cells, providing cushioning and ensuring our cells replicate.
A.
正确
B.
错误
【简答题】一个旅行者走进了下野的有钱的的书斋,看见有许多很贵的砚石,便说中国是“文雅的国度”。一个观察者到上海来一下,买几种的书和图画,再去寻奇怪的观览物事,便说中国“的国度”。
【多选题】Proteoglycans perform many sophisticated functions in addition to providing hydrated space around cells. What are their other functions?
A.
They can form gels of varying pore size and charge density that act as filters to regulate the passage of molecules through the extracellular medium.
B.
They can bind secreted growth factors and other proteins that serve as extracellular signals for cells.
C.
They can block, encourage, or guide cell migration through the matrix.
D.
In all these ways, the matrix components influence the behavior of cells, often the same cells that make the matrix—a reciprocal interaction that has important effects on cell differentiation and the arrangement of cells in a tissue.
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