问题
单项选择题 A1/A2型题
半抗原一般指分子量小于多少的有机物质()。
A.50000
B.40000
C.4000
D.5000
E.3000
答案
参考答案:C
解析:半抗原分子量一般小于4000。
半抗原一般指分子量小于多少的有机物质()。
A.50000
B.40000
C.4000
D.5000
E.3000
参考答案:C
解析:半抗原分子量一般小于4000。
用方框内所给词的适当形式填空。 | |
2. Students usually _____ learning English in primary schools. 3. They _____ a big party to celebrate (庆祝) the harvest last October. 4. Professor Li stopped _____ after he had a heart disease. 5. I _____ Lucy last night, but she was not at home. |