不中断,无瞬变交流电源的输出设备有()。
A.蓄电池
B.UPS
C.开关电源
D.交流配电屏
参考答案:B
The idea reading too many books ruins your eyes is wrong. [ ]
A. which
B. when
C. that
D. how
我国急性胰腺炎的病因最常见为()
A.药物诱发(类固醇激素等)
B.腮腺炎合并
C.高血钙症
D.胆囊炎,胆结石
E.壶腹部肿瘤