吹脱捕集气相色谱法测定水样中的丙烯腈和丙烯醛时,常用()法定量。
参考答案:内标
---Sorry, but I can’t visit you tomorrow.
---Come whenever it is to your .
A.pleasure
B.convenience
C.preference
D.connection
肉瘤的主要病因是:()
A.气滞
B.血瘀
C.血虚
D.寒凝
E.痰凝