给出下列四个命题:①若,且则;②设,命题“若”的否命题是真命题;③函数的一条对称轴是直线;④若定义在上的函数是奇函数,则对定义域内的任意必有.其中,所有正确命题的序号是 .
TianWen 1,China's (one) Mars probe (探测器) successfully entered space in February.
We are (excite) to see that Chinese vaccines (疫苗) are used around the world now.
Each of (we) should study hard and do something for our country.
The list of winners will (put) up on the school website.
I accepted an (invite) to the party from my friend.