题目内容

血小板

A.呈双凸扁盘状
B.由巨核细胞胞质脱落形成
C.健康成年人为10万-30万个/mm3
D.平均寿命约120天
E.在止血和凝血过程中起重要作用

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每立方毫米血液中,红细胞的正常值是

A. 3~5万
B. 350~550万
C. 4000~10000个
D. 10~30万
E. 10~20万

2.单核细胞的特点是

A.核染色质疏松,着色浅
B.可作变形运动,穿过血管壁
C.是血液中最大的白细胞
D.胞质较多,常染成浅蓝色
E.含散在的嗜天青颗粒

血液是一种结缔组织,它的___相当于细胞间质,其中___相当于基质,___相当于纤维。

[Unit 7] Directions: Choose the statement that best summarizes the main idea of Text A in Unit 7 Materials Science.

A. The significance of materials extend beyond scientific scope and into the emotional spectrum.
B. Materials are so fundamentally important to us that we have to reexamine materiality in order to understand the world.
C. Quantum mechanics vastly changed the way people see materials and will continue to hold an important position in future’s material science.

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