电气设备有三种工作状态，即（）状态。
A.运行
B.检修
C.试验
D.备用
参考答案：A, B, D
颞下颌关节骨关节病是指颞下颌关节组织发生磨损与变质，在____________的非炎症性病变。
The science of medicine, progress has been very rapid lately, is perhaps the most important of all the sciences.
A．to which
B．in which
C．which
D．with which
