把一段金属放置在静电场内，根据（）的原理可知，不带电的金属导体产生一个与原电场强度反

Dear all,

Time passes without knowing. I have finally found my partner in Paris. She gives me the true meaning of love, happiness and also as a true friend.

Here,I want to announce that we,Paul Brown and Lisa Yang have decided to marry on 26 th Sep­tember, 2007. The wedding will consist of a wed­ding promise in a church and a dinner party that will be held in Blue Sky Hotel.

As you are our friends and our relatives, all of you and also your loved ones are invited to this spe­cial day of ours, you, looking, we, all, to, forward, of,are. Thank you for your time here.

Love,

Paul & Lisa

根据上面的邀请信，完成81—85小题。

小题1:Paul is going to marry______________________.

小题2:The young couple got to know each other in                       

小题3: Date of their marriage:_______________________

小题4: Place of their dinner party,;_______________

小题5: Put the underlined words in right order.

I had a hard time ________ my English last term.

A．with

B．at

C．in

D．for

如果因设备原因使漏风率突然增大，为确保烧好烧透就应（）。

标准分数具有一定的参照点，但单位不等。 ( )

为什么变速器的中心距A对齿轮的接触强度有影响？并说明是如何影响的？