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【多选题】
How does the Na + pump undergo a series of conformational changes as it exchanges Na + ions for K + ?A.
The binding of cytosolic Na + (1) and the subsequent phosphorylation by ATP of the cytosolic face of the pump (2) induce the protein to undergo conformational changes that transfer the Na + across the membrane and release it outside the cell (3).
B.
The high-energy linkage of the phosphate to the protein provides the energy to drive the conformational changes.
C.
The binding of K + from the extracellular space (4) and the subsequent dephosphorylation (5) allow the protein to return to its original conformation, which transfers the K + across the membrane and releases it into the cytosol (6).
D.
The real pump in mammalian cells contains three binding sites for Na + and two for K + . The net result of one cycle of the pump is therefore the transport of three Na + out and two K + in. Ouabain inhibits the pump by preventing K + binding (4).
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【简答题】( 理想型文学与象征型文学都通过运用变形手法,来获得惊异感。 ) 判断这一观点正确或错误之原因的 详细 分析( 原因写得过于简单会酌情扣分的 )。
【简答题】某工程现浇钢筋混凝土框架有梁板，尺寸如下图所示。混凝土强度等级为C25，现场搅拌混凝土。人工、材料、机械单价根据价目表计算，管理费率为5.1%，利润率为3.2%。编制现浇钢筋混凝土框架有梁板工程量清单，进行工程量清单报价。
【简答题】某现浇钢筋混凝土有梁板,如图所示,胶合板模板,钢支撑,计算有梁板模板工程量,确定定额项目。
【多选题】胸部损伤时（）
A.
广泛性进行性皮下气肿是高压气胸的特征
B.
窒息表现为上半身发绀
C.
胸部爆震伤是高压气浪＞中击胸部所致肺水肿、肺毛细血管出血
D.
多根肋骨骨折可引起大块胸壁软化
E.
多根肋骨骨折可引起纵隔摆动
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