局麻时最易形成血肿的麻醉方法是
A.上牙槽前神经局部浸润麻醉
B.鼻腭神经阻滞麻醉
C.下牙槽神经阻滞麻醉
D.腭大孔阻滞麻醉
E.上颌结节阻滞麻醉
参考答案:E
The city will have trees and pollution.[ ]
A. more ; fewer
B. less ; fewer
C. more ;less
D. less ; less
僵烧镁氧矿( ) A.15 B.14 C.28 D.17