如果改变条件，破坏蛋白质溶液的稳定性，蛋白质就会从溶液中沉淀出来，沉淀蛋白质的方法有

A、贝多芬协奏曲

B、贝多芬奏鸣曲

C、贝多芬变奏曲

D、贝多芬小品

A、投影与投影轴是倾斜的

B、投影小于空间实长

C、有等于空间实长的投影

D、有平行于投影轴的投影

A、Although we have overcome the problem of the design for the structure of the bridge, we are still confronted with many difficulties concerning its actual construction.

B、Although the problem of the design for the structure of the bridge has been overcome, we still confront many difficulties concerning its actual construction.

C、/

D、/

A、寒冷的中高纬度地区

B、温暖的中高纬度地区

C、中低纬地区

D、赤道地区

A、P35568

B、Q9XTN2

C、P35569

D、B3N946