氯霉素的抗菌作用是由于抑制了细菌的()。
A.核蛋白体上的转肽酶
B.细胞色素氧化酶
C.二氢叶酸还原酶
D.嘌呤核苷酸代谢
E.基因表达
参考答案:A
动词填空 用所给动词的适当形式填空。
1. My father usually ______(watch) TV in the evening.
2. Look. The students ______(play) basketball over there.
3. We enjoy ______(live) in the city very much.
4. —______ they ______(go) to the beach yesterday?
—No, they didn't. They _____(go) to the park.
5. I ______(be) born on July 23rd, 1991.
6. Charles Smith started ______(hiccup) in 1922.
7. Lucy ______(invite) her friends to her party next Sunday.
在滚动式计划中,______。
A.关注长期目标,允许短期目标作为持续活动的一部分进行滚动
B.近期要完成的工作在工作分解结构最下层详细规划
C.远期要完成的工作在工作分解结构最下层详细规划
D.为了保证项目里程碑,在战略计划阶段做好一系列详细的活动计划