从保护口腔组织的角度,桥体设计时应避免().
A.自洁作用好
B.龈端与粘膜紧密接触
C.桥体在满足强度的情况下尽量缩小
D.适当减少桥体颊舌径
E.尽量制成瓷龈底
参考答案:B
Some government officials in the USA have pointed out that the death of Osama Bin Laden means
keen vigilance (警戒) _____ the end of terrorism. [ ]
A. more than
B. better than
C. other than
D. rather than
直接经济损失包括设备损失费、行包货物损失费、行车中断损失费和事故应急处置费。