题目内容

A country's future ____depends, to a degree, upon the quality of education of its people.

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He was ____with his business matters and didn't have time to think about holiday.

For the purpose of ____, We labeled each sample with a number.

In many cultures, eggs are an obvious symbol of new life, and the newborn chicks are a lovely ____of new growth.

有效值、频率和角频率是指正弦交流电的三要素。

A. 对
B. 错