问题
单项选择题
在HPLC中，如果发现分离度有所下降，则可以通过（）进样量或进样体积进行试验改进分离度。
A.增大
B.减小
C.反复增大和减小
D.进样量和分离度无关
答案
参考答案：B
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在HPLC中，如果发现分离度有所下降，则可以通过（）进样量或进样体积进行试验改进分离度。
A.增大
B.减小
C.反复增大和减小
D.进样量和分离度无关
参考答案：B
| 用所给单词的适当形式填空。 | |
| Have you ever heard the song __1__ (call)is there anyone who told you? It may be impossible for you __2__ (not know)the song and its singer. It __3__ (sing) by the famous "Happy Boy" Chen Chusheng, who appeared on Hunan Satellite TV. He caught everyone's attention. Before the competition he was just a farmer's son who had never gotten professional trainings of any kind. As a child, Chusheng wasn't a good student, but he was very __4__ (interest)in music. He liked to listen to and sing his favorite songs again and again. Like many other parents, his parents also wanted him __5__ (go)to college, but he failed. Chusheng had no choice but to help his brother repair bicycles and motorbikes. In Sanya, a small city in Hainan Province, Chen Chusheng worked during the claylime while __6__ (sing)in different bars in the evening. He lived like that until the year 2000. In 2000, Chen went to Shenzhen. He never thought that his first job in this new place __7__ (be) delivering (投递) food. He went on __8__ (work)in the daytime while singing in the evening. His life was hard at that time. In the bar called Star-making Factories he __9__ (meet)many famous local musicians. In the following several years, Chen, with his musical dream, attended many music contests throughout the country winning prizes many times. Today, when we think about his success, we __10__ (not help) thinking that if one wants to be successful, he should work harder than others. | |
| 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ | 6. _____ 7. _____ 8. _____ 9. _____ 10. _____ |