【单选题】—What's your mother's name? —____. [ ]
【单选题】What’s Judy and Nick’s task at last?
【单选题】— ______. — I have a sore throat. [ ]
A.
What's the matter, Judy?
D.
What did you do, Judy? v
【单选题】—_____. —I have a headache. [ ]
A.
What's the matter, Judy?
D.
What are you doing, Judy?
【判断题】滚动轴承通常是:外圈装在机座的孔内,固定不动。内圈装在轴上,随轴转动。