A．线速度大的，角速度也一定大
B．角速度大的，周期一定短
C．周期短的，线速度一定大
D．转速快的，线速度一定大
答案：B
根据上下文补全对话。
A: Where __1__ you go yesterday?
B: I __2__ to the aquarium with my classmates.
A: __3__ there any sea animals?
B: Yes, of course. There __4__ seals, dolphins, octopuses and so on.
A: That sounds interesting. Did you __5__ any photos?
B: Sure. What did you __6__ yesterday?
A: I __7__ a great time on our school trip. We __8__ the mountains and had a picnic there. Finally,
tired __9__ happy, we __10__ back to school.
简述西周“明德慎罚”思想的主要内容。
