聚合物注入井必须严格执行()方案。
A、配产
B、配注
C、配制
D、注入
参考答案:B
— Will you please stay here for the party?
— Sorry, I _____. I'll have to go to an important meeting. [ ]
A. mustn't
B. needn't
C. can't
D. won't
血管介入放射学插管操作最常用的抗凝药物是()。
A.维生素K1
B.肝素钠
C.阿司匹林
D.潘生丁
E.尿激酶