DRAPL退火炉NOx排放量为≤()ppm。
A:120
B:150炉内气氛的氧含量:2~4%;
C:200。
参考答案:A
根管治疗过程发生的并发症中.可能引起严重后果的是
A.急性根尖炎
B.急性根尖周炎
C.器械折断
D.侧壁穿刺
E.器械误吞误吸
It must comply strictly in safety standards to be accepted by the public, and at the same time it must demonstrate that no health or environmental damage occurs.
A. than B. toC. from D. with