采用统一精基准原则的好处有()
A.有利于保证被加工面的形状精度
B.有利于保证被加工面之间的位置精度
C.可以简化夹具设计与制造
D.可以减少加工余量
参考答案:B, C
在横线上填入适当的单词补全对话
Nancy: Hi, Tom.
Tom: Hello, Nancy.
Nancy: What are you doing?
Tom: I am 1 to music.
Nancy: Would you like to come over to my house? We can 2 computer games together.
Tom: OK, I'd love to. 3 is your house?
Nancy: My house is on Bridge Street. It's next 4 a supermarket.
Tom: Oh, I know where that is. It is across from the post 5 .
Nancy: Yes. You're right.
Tom: I'll see you at three in the afternoon.
完成下面关于起飞性能的句子。飞机开始起飞后,发动机在()失效,允许的反应时间为(),必须保证飞机在()内能够停下来。
A、V1;2s;中断起飞可用距离
B、V2;3s;起飞可用距离
C、V1;1s;中断起飞可用距离