新投或大修后变压器送电,重瓦斯应先改投信号位置。
参考答案:对
有关细菌性痢疾下列哪项是错误的
A.菌痢常见致病菌为福氏痢疾杆菌,宋内氏次之
B.“依链”痢疾杆菌活菌苗可用作人工主动免疫
C.菌痢是属于侵袭性腹泻
D.所有的痢疾杆菌只有内毒素
E.菌痢主要病变部位是直肠,乙状结肠
It has been announced recently that all the schools________ not have the students attend school if the
students have high temperatures.[ ]
A. need
B. shall
C. could
D. ought to