—Sorry, I don't know. But I know that Mr. Chen is going to _______ a nurse next month.
A:did they marry; marry to
B:did they get marry; marry with
C:have they get married; marry
D:have they been married; marry
将装有甲烷和氯气混合气体的三个集气瓶,用玻璃片把瓶口盖好后,分别作如下处理,各有怎样的现象发生.
阅读下面的图表,根据要求完成题目。
(1)给图表拟一个标题。(不超过25字)
□□□□□□□□□□□□□□□□□□□□□□□□□____
(2)根据图表数据,得出相关结论。(不超过40字)
□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□____
已知定义在R上的函数fx=ex+x2-x+sinx,则曲线y=fx在点0,f0处的切线方程是( )