English is used in many situations. ____________, this doesn’t mean that people who use it can speak English in all situations.
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English is the _________ language of more than seventy-five countries.
Business need a common language to ______________ communication.
The boldfaced words below are from a lecture about English as a global language. Read each sentence. Write the letter of the word or phrase that is closest in meaning to the boldfaced word.
对于不同阻值的RX值,应选择不同量程,尽量使RX与RZ值()。