【单选题】在基因诊断技术中,所用的DNA分子探针中必须存在一定量的放射性同位素,后者的作用是
【判断题】排球比赛中拦网时如球碰到拦网队员的脚或腿视为犯规
【判断题】If you’re the chair of a meeting, you need to start the meeting on time.
【单选题】--- ____? -- Yes. What time is it on Friday?
A.
Are you coming to the meeting on Friday
B.
When will the meeting start
C.
What are you going to do this Friday
【单选题】关于受精过程的叙述错误的是()
A.
获能后的精子与卵子相遇后,释放顶体酶穿过透明带进人放射冠
【单选题】李白的诗歌《宣州谢脁楼饯别校书叔云》体裁是