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【单选题】
圆锥行星齿轮式差速器主要由行星齿轮、行星齿轮轴、()齿轮和差速器壳体等组成。A.
圆锥
B.
圆柱
C.
双曲面
D.
半轴
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举一反三
【单选题】What cell produces the cartilaginous matrix?
A.
Chondrocyte
B.
Chondroblast
C.
Osteocyte
D.
Osteoclast
E.
Bone lining cell
【简答题】某 周一早晨八点,接群众举报,一妇女在公交车上手机被偷了,她认为的嫌疑人不承认,双方在车上大吵,并找司机理论,迫使公交车不能运行,停在公交站。警察在 盘查时,嫌疑人不配合。进一步盘查,人身搜查时,搜到了匕首和 说不清来历手机。 嫌疑人以东西不是我偷的为由,不配合。根据此案设置详细的实施预案。
【简答题】拉伸试验时试样拉断前能承受的最大应力称为材料的
【单选题】In the process of cloning, what ultimately activates the cell to start dividing?
A.
An cell inserted into an egg.
B.
An electronic stimulation.
C.
An artificially fertilised egg.
D.
Another donor cell.
【多选题】What is the function of cell cortex?
A.
Although actin is found throughout the cytoplasm of a eukaryotic cell, in many cells it is highly concentrated in a layer just beneath the plasma membrane. In this region, called the cell cortex, actin filaments are linked by actin-binding proteins into a meshwork that supports the plasma membrane and gives it mechanical strength.
B.
In human red blood cells, for example, a and regular network of fibrous proteins—including actin and spectrin filaments—attaches to the plasma membrane, providing the support necessary for the cells to maintain their discoid shape.
C.
In other animal cells, the cortex includes a much denser network of actin filaments that are cross-linked into a three-dimensional meshwork.
D.
The rearrangements of actin filaments within the cortex provide much of the molecular basis for changes in both cell shape and cell locomotion.
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