变压器油的能吸收绕组和铁芯产生的热量,起到散热、冷却和()作用。
A.润滑
B.降压
C.绝缘
参考答案:C
选出错误的一项,在横线上写出正确答案。
( ) 1. He is write a letter. _________________
A B C
( ) 2. The onion are in the refrigerator. _________________
( ) 3. He never wear dresses. _________________
( ) 4. This ball is big than another. _________________
( ) 5. I have a pair of skate. _________________
( ) 6. I take of my shorts and T-shirt. _________________
( ) 7. The star always go on top. _________________
( ) 8. Will you like to help us? _________________
( ) 9. Today we are buy Christmas gifts. _________________
( ) 10. These are child. _________________
下列哪些证据能够说明风湿病与A组乙型溶血性链球菌感染有关:
A.多发于链球菌感染的高发地区
B.患者血清抗链O滴度增高
C.抗生素治疗可减少风湿病的发病及复发
D.多发于链球菌感染的高发季节
E.发病前常有链球菌感染的病史