2ASK信号的带宽B2ASK是单极性数字基带信号带宽的倍

2, Are you ready to ____ ? A: order B: ask C: take D: make

Passengers ______ to fasten their belts. A: ask B: will ask C: to ask D: are asked

I ______ a question. I did not ______ an answer. A: asked……ask for B: asked……ask C: asked for……ask for D: asked for……ask

The student is shy and he ______ questions in class. A: dares not ask B: does not dare to ask C: dares not to ask D: does not dare ask

6. Don't be afraid to______advice about things you are not good at. A: ask for B: ask to C: ask about D: ask out

If I were to see Tom, what ( )_ you me to tell him? A: are ,going to ask B: do , ask C: would , ask D: did, ask

If you have any problems, come to me and _____ help. A: ask about B: ask out C: ask for

Conversation 2 8（） A: To make an apology. B: To place an order. C: To ask about delivery. D: To cancel an appointment.

Steven would like _______ his own living than _______ help from his parents. A: to make ,ask for B: make , to ask for C: to make ,to ask for D: make , ask for