陶瓷器是陶器制品和瓷器制品的总称。中国陶瓷制造历史悠久，早在七八千年前的新石器时代，华夏大地的先民就已经制造和使用瓷器。
参考答案：错
补全对话请根据所提供的情景，补全下面的对话。
A: Good morning. I'm from School Today. Would you like to answer my questions?
B: Yes, I'd like to. Please!
A: 1 ?
B: My name is Michael. 2 ?
A: Nice to see you, too. Welcome to our school.
B: 3 ?
A: 4 ?
B: I'm from New York.
A: Are you a middle school student?
B: 5 ?
A: 6 ?
B: I'm 15.
A: 7 ?
B: Because I love Chinese food very much.
A: 8 ?
B: I usually go to school on foot. I live near our school.
A: 9 ?
B: I like basketball best.
A: 10 ?
B: I often play basketball after school.
A: Thank you.
B: That's all right.
对于以下列举的各个实例中（均不计空气阻力），哪种情况机械能是不守恒的（ ）
