问题
问答题 简答题
成人牙周炎的可疑致病菌有哪些?
答案
参考答案：
目前认为成人牙周炎的可疑致病菌有：牙龈卟啉单胞菌、中间普氏菌、福赛类杆菌、直肠弯曲杆菌、核梭杆菌。
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成人牙周炎的可疑致病菌有哪些?
参考答案：
目前认为成人牙周炎的可疑致病菌有：牙龈卟啉单胞菌、中间普氏菌、福赛类杆菌、直肠弯曲杆菌、核梭杆菌。
Passage One
According to the speaker, how does the price of an electronic keyboard compare with the price of a piano
A．The electronic instrument is much more expensive.
B．The electronic instrument is slightly more expensive.
C．The piano is slightly more expensive.
D．The piano is much more expensive.