【简答题】The number of mature female green turtles that return to their primary nesting beach has gone down from 1,280 ten years ago to 145 today. (gone down) ___________
【单选题】关于受精,下列哪项是错误的
B.
精子与卵子相遇,精子顶体外膜破裂,释放出顶体酶
C.
精子必须在顶体酶的作用下才能穿过放射冠、透明带与卵子接触
【简答题】The number of mature female green turtles that return to their primary nesting beach has (gone down) from 1,280 ten years ago to 145 today.
【简答题】Choose one word or phrase from the bracket to make the sentence more formal. The number of mature female green turtles that return to their primary nesting beach has ____________ (gone down; decreased...
【简答题】Choose one word or phrase from the bracket to make the sentence more formal. The number of mature female green turtles that return to their primary nesting beach has _________ (decreased; gone down) f...
【简答题】编一程序,将 2000 年到 3000 年中的所有闰年年份输出并统计出闰年的总年 数,要求每 10 个闰年放在一行输出。
【判断题】钢进行奥氏体化的温度愈高,保温时间愈长则过冷 A愈不稳定,C曲线愈靠左。
【单选题】从1994年开始,我国进行了7次全国森林资源清查,到2008年全部完成调查任务。我国目前的森林覆盖率是()