低厂变的电压变比是多少?
参考答案:6300V±2X2.5%/380V。
选择与句中划线部分意思相同或相近的词或短语。
— Where does a bird live?
— I don't know.
A. I've no idea.
B. I can't say it
C. I want to know
D. Do you know
下列不属于丛集性头痛特点的是()
A.一侧眼眶周围发作性疼痛
B.常伴恶心、呕吐
C.头痛突然发生,无先兆症状
D.呈尖锐、爆炸样、非搏动性疼痛
E.常伴同侧颜面部自主神经功能症状