问题
单项选择题
进行梯度洗脱，若用50g吸附剂，一般每份洗脱液量常为（）
A.20rnL
B.100rnL
C.50rnL
D.90rnL
答案
参考答案：C
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进行梯度洗脱，若用50g吸附剂，一般每份洗脱液量常为（）
A.20rnL
B.100rnL
C.50rnL
D.90rnL
参考答案：C
| 阅读理解。 | |||||||||||||||||
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| 1. Where does Lucy meet Tim? | |||||||||||||||||
| A. At Frank’s house. B. At Lucy’s house. C. At the station. D. In the hospital. | |||||||||||||||||
| 2. How many hours a week does Lucy do her part-time job? | |||||||||||||||||
| A. Five hours. B. Eight hours. C. Ten hours. D. Eleven hours. | |||||||||||||||||
| 3. is ill in hospital. | |||||||||||||||||
| A. Lucy B. Lily C. Tim D. Ricky | |||||||||||||||||
| 4.Her uncle Ricky is coming on . | |||||||||||||||||
| A. Saturday B. Friday C. Thursday D. Wednesday | |||||||||||||||||
| 5. What does Lucy do on Saturday evening? | |||||||||||||||||
| A. Have a birthday party B. Study with Frank C. Play volleyball D. Do part-time job. | |||||||||||||||||