用配位滴定法测定硫酸锌含量时,所使用的指示剂是()
A.甲基红
B.酚酞
C.淀粉
D.铬酸钾
E.铬黑T
参考答案:E
Patrick is interested in animals, so he enjoys _ every Saturday working in an animal hospital.
A.paying
B.getting
C.taking
D.spending
眼睑基底细胞癌单纯放疗的治愈率可达到()。
A.50%~60%
B.60%~70%
C.70%~80%
D.80%~90%
E.90%以上