植物体的主要组织有____、____、____、____.
针对下列现象,分析我们应负的社会责任。
根据文章意思,正确排序。
①Yes, we have a new music teacher.
②Do you like her?
③Is she old?
④Do you have new teachers?
⑤ No, she isn’t. She is funny.
⑥Yes, we all like her.
____
道路交通法规定,不满 周岁的儿童不准在道路上骑自行车。( )
已知 fx=ax3+3x2+2 且 f'-1=4 ,则实数 a 的值等于____