保护接零应采用一处或多处重复接地,起作用是什么?
参考答案:
一方面在系统发生相线碰壳时,可以降低中性线的对地电压。另一方面在中性线断裂时,可以减轻故障的危害程度。
无菌药品生产应当尽可能()包装材料、容器和设备的清洗、干燥和灭菌的间隔时间以及灭菌至使用的间隔时间。
In ensuring an effective meeting the project manager should______.
A.establish a meeting policy
B.always call a meeting even if the pro]ect manager is not sure there is a real need
C.alter the agenda during the meeting to ensure all of the problems are solved during the meeting
D.not encourage participation from everyone as this will prolong the meeting