不同频率的正弦量之间()存在相位差的概念。
参考答案:不
Great changes have taken place in my home town. It’s no longer ______ it was ten years ago, ______ I spent my childhood there.
A.what, when
B.that, where
C.as, which
D.which, that
把文言文阅读材料中画横线的句子翻译成现代汉语。
⑴既其出,则或咎其欲出者,而余亦悔其随之而不得极夫游之乐也。
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⑵帝忧形于色,对朝嗟叹,欲尽罢法度之不善者。