题目内容
函数f(x)=|x|在x=0的微分是（ ）
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A local guide should consult with the tour leader to confirm the itinerary if there are some difference in the travel schedule.
A local guide has the right to make some reasonable adjustment of the itinerary according to the travel schedule or the daily route.
A local guide can take tourists to go sightseeing according to the travel schedule without consulting with the national guide about the local travel arrangements.
A local guide should change the itinerary if tourists want to because he should put the customers first.
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