在刚体运动过程中，若刚体内任一平面始终与某固定平面平行，则这种运动就是刚体的平面运动。
参考答案：错
用适当的句子补全对话。
Jack: Good morning, Betty! 1._____
Lucy: We're raising money for Hope School. 2._____
Jack: No.What is a Hope School?
Lucy: It's a school for poor children.And Project Hope has built many schools.
Jack: 3._____ Tell me more about it.
Lucy: 4._____
A. That sounds interesting.
B. What are you doing?
C. Have you been to a Hope School?
D. No problem.
哪一部法律的颁布实施，是企业法律制度的一大突破( 》。
A．《中华人民共和国全民所有制工业企业法》
B．《中华人民共和国经济合同法》
C．《中华人民共和国集体所有制企业法》
D．《中华人民共和国公司法》
are you doing?