What is the airmail letter rate to Peru?

寄航空信件到秘鲁的邮资是多少？

youdao

youdao

Derivative action (referred to by the letter d) measures and responds to the rate of change of process signal, and adjusts the output of the controller to minimise overshoot.

微分动作(字母d表示)测量并对过程信号变化率进行反应，调整控制器的输出以达到最小的突出峰。

youdao

.. In 1799, it would cost so much to mail a letter-- I don't know exactly, something like $10 or $20 to mail a letter at today's rate-- and it would take a long time get there.

在1799年，寄封信需要花费-,我也不清楚具体的数字,大概相当于现在的10到20块钱-,而且还要花很久才能送达。

耶鲁公开课 - 金融市场课程节选

When the response rate is slower than a letter, you wonder what social is for.

FORBES: Welcome to The World of Protest in The Age Of Social Media

Michael Brozzetti of Philadelphia got a letter saying that the spread over the prime rate would jump to 4% from 1.5%, yielding a 7.25% rate come May, according to the notice he got from the bank on March 7.

WSJ: Wells Fargo to Increase Interest Rates on Some Small-Business Credit Lines

Although this was still well above the 2% target, the Bank of England governor, Mervyn King, said in a letter to the chancellor that inflation was set to fall "materially" below the target rate in the second half of 2009.

BBC: Bank considered bigger rate cut