为防止运行中的锅炉鼓风机、引风机发生触电事故,应采取哪些措施?
参考答案:确保鼓、引风机接线完好,鼓风机、引风机固定牢固,护罩完好。人员不能湿手操作开关。
This question isn't easy. It's very _____. [ ]
A. difficult
B. difficulty
C. easy
D. not easy
头痛局限在内眦或鼻根部()。
A.上颌窦炎
B.筛窦炎
C.额窦炎
D.后组鼻窦
E.前组鼻窦