-Didn't you see the sign "No parking!" on the right?
-Sorry, I didn't. But now I know parking ____________ here.
A: wasn't allowed
B:isn't allowed
C:won't allow
D:doesn't allo
已知:①BrR1 →THFMg BrMgR1 →BrR2 R1﹣R2(THF为一种有机溶剂)
②C6H5﹣O﹣R ①Li,THF,室温②H3O+ C6H5﹣OH
请回答下列问题:
把一个三位小数精确到十分位后是5.0,这个三位小数最小是( )
朗读课文,把握全篇的感情基调。说说课文几次写到秋天,为什么文章的题目叫“秋天的怀念”?
夏季,人们喜欢吃清凉可口的西瓜,请识别西瓜属于哪种器官( )