若产品在规定的条件下,规定的时间为r,从开始工作到发生故障的连续工作时间为T,则产品的可靠度为()。
A.R(t)
B.F(t)
C.λ(t)
D.E(t)
参考答案:A
完成句子。
1. I did my homework after supper yesterday. (改为一般疑问句)
_____ you _____ your homework after supper yesterday?
2. You mustn't open the window now. (改为祈使句)
_____ _____ the window now.
3. She became a super star at the age of eighteen. (对划线部分提问)
_____ _____ she become a super star?
4. Please remember to close the door when you go out. (改为同义旬)
Please_____ _____ to close the door when you go out.
5. 他长大后要干什么? (汉译英)
What is he going to be when he_____ _____ ?
EMSS的第三个环节是___________。