导致根尖周病的主要感染途径是(  )。

导致根尖周病的主要感染途径是(  )。A.感染根管 B.邻牙病波及 C.深牙周袋 D.血行感染 E.以上都不是

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The attitude of the author towards the research project is

The attitude of the author towards the research project isA.positiv B.negativ C.

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Which country is the largest coffee producer?

Which country is the largest coffee producer?A.Brazi B.Colombi C.Ethiopi D.Egyp

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Even the most sophisticated Japanese robots are ___________

Even the most sophisticated Japanese robots are ___________

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牙骨质龋属于(  )。

牙骨质龋属于(  )。A.中龋 B.浅龋 C.慢性龋 D.深龋 E.继发龋

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