与急性根尖周炎和根管恶臭密切相关的细菌有
A.产黑色素普氏菌
B.牙髓卟啉单胞菌
C.牙龈卟啉单胞菌
D.梭形杆菌
E.乳酸杆菌
参考答案:A
. — Do you think there is anything ____ interest in the exhibition?
— Yes, I think some of the pictures are ____.
A.for; of help
B.of; of great help
C.in; of helpful
D.at; helpful
在零件进行冲压CAE分析过程中经常出现起皱现象,下列哪个措施不是解决起皱问题的常用措施。()
A、增加吸料筋
B、提高压边力
C、降低压边力