题目内容

通解中各任意常数取特定值时所得到的解称为()

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未知函数是一元函数,含有未知函数的导数的微分方程称为()

未知函数是多元函数,含有未知函数的偏导数的微分方程称为()

It is considered ______ for a woman to ask a man on a date in America.

A. proper
B. improper
C. impossible
D. rude

When you are new to American dating culture, you should understand common accepted dating customs to __________.

Avoid offending your potential dates
B. Have a good date
C. Avoid making mistakes
D. Have a good time with your date

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