問答題

D13 ,D14是保護(hù)二極管,當(dāng)輸入短路時(shí),給C7,（）一個(gè)放電回路

答案： ["C8"]

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單項(xiàng)選擇題

DEFULT:pln one’ s scheduleB．lter one’s idesC．fulfill one’s obligtionsD．mintin oneDEFULT:pl

n one’ s schedule B．lter one’s ides C．fulfill one’s obligtions D．mintin one’s composure E．hord one’s possessionsA．plan one’ s scheduleB．a(chǎn)lter one’s ideasC．fulfill one’s obligationsD．maintain one’s composurE．hoard one’s possessions

The （）________________ have opened up a whole new field of the medicine.

答案： discoveries