尿NIT试验阳性结果的产生取决于_______、_______和_______。
参考答案:感染细菌是否含有硝酸盐还原酶;食物中是否含有适量的硝酸盐;尿液标本是否在膀胱4h以上
I got in his old truck and off ______ to one of the far corners of the farm to fix the fence. [ ]
A. did we go
B. we did go
C. we went
D. went we
和三氯乙酸反应,加热至60℃则产生红至紫色的苷为
A.甘草皂苷B.紫胡皂苷C.人参皂苷D.知母皂苷E.木脂素苷