门联锁未到位而受电弓无法升起的原因是因为门联锁控制了升弓电空阀85（86）无法得电动作。
参考答案：错
Walter offered us a lift when he was leaving the office, but our work _______, we refused his offer.
A．not finishing
B．had not been finished
C．not having finished
D．not finished
主要感染部位按院内感染发病率高低排列最高为（）
A.肺部
B.血液
C.尿路
D.手术部位感染
