如何清除火花塞积炭?
参考答案:
火花塞轻度积炭时,可用铜丝刷清洁;严重时,先将火花塞在丙酮或煤油中浸泡,待积炭软化后,再用铜丝刷清洗,不可用刮刀、砂纸清除积炭。
良性肿瘤中常见的是()
A.腺瘤样瘤
B. * * 状瘤
C.血管瘤
D.平滑肌瘤
E.脂肪瘤
One minute she burst into ________ and the next burst out ________. [ ]
A. crying; laughter
B. tears; laughing
C. tear; laughter
D. crying; laughing