碱性尿中能见到的结晶为()。
A.尿酸钠
B.尿酸
C.尿酸铵
D.非结晶性尿酸盐
E.磺胺结晶
参考答案:C
解析:尿路感染时,由于细菌分解尿素产生氨等,使尿液pH增高,产生尿酸铵结晶。
But for their help, we _____ the program in time. [ ]
A. cannot finish
B. will not finish
C. had not finished
D. could not have finished
基因工程