考虑被加工表面技术要求是选择加工方法的唯一依据。
参考答案:错
欲将蛋白质从水溶液中析出而又不改变蛋白质的性质,应加入的试剂是[ ]
A.NaOH溶液
B.(NH4)2SO4溶液
C.CuSO4溶液
D.酒精溶液
People try to avoid public transportation delays by using their own cars,and this creates further
problems.[ ]
A.in short
B.in case
C.in doubt
D.in turn