电信用户申告电信服务障碍的,电信业务经营者应当自接到申告之日起,城镇()小时、农村72小时内修复或者调通。
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________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
Shehadclearlyno________ofdoinganywork,althoughshewasverywellpaid.
设f(0)=0,则f(x)在x=0处可导の充要条件为()
设函数f(x)在x=0处连续,下列命题错误的是()