容量血管是指（） ["大动脉","中等动脉","小动脉","静脉","微动脉"]
维系蛋白质分子一级结构的化学键是（） ["离子键","肽键","二硫键","氢键","疏水键"]
冲裁模具总装配要点？
滚环复制（） ["移码突变","双链环状DNA，一股开环，另一股不开环的复制","一股单链不间断，另一股单链成片段的复制","用RNA作模板的DNA复制","需特异的核酸内切酶和polⅠ参与"]
薄胶皮两辊压延生产压缩空气压力不低于（） ["0.8Mpa","0.6Mpa","0.5Mpa","0.7Mpa"]
圆锥投影
