题目内容

With representatives from more than 140 countries __________ via video, the special session allowed them to survey the wreckage of the COVID-19 pandemic together.(guarantee; participate; provide)

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The UN will try its best to __________ all people have access to vaccines.(guarantee; participate; provide)

As the UN chief urged, the pandemic has __________ the world an opportunity “for change”, and it is time for a reset.(guarantee; participate; provide)

已知FOSC＝6MHZ，试编写程序，利用T0工作在方式2，使P1.0和P1.1分别输出周期为1ms和400us的方波。

当FOSC＝6MHZ和FOSC＝12MHZ时，最大定时值各为多少？