微分方程(ex+y-ex)dx+(ex+y+ey)dy=0的通解是( )
A. ex(ey-1)=C
B. (ex+1)ey=C
C. (ex+1)(ey-1)=C
D. (ex+1)(ey+1)=C
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微分方程cos x sin ydx+sin x cos ydy=0的通解是( )
A. sin x sin y=C
B. sin x +sin y=C
C. sin x /sin y=C
D. sin x -sin y=C
______-aroma baijiu is most closely associated with Sichuan Province.
A. Strong
B. Light
C. Sauce
D. Rice
________ once said:“The daunting route into the region of Shu is more daunting than climbing the sky.”
A. Wang Anshi
B. Li Bai
C. Bai Juyi
Du Fu
Cui Ning created Gaiwan tea because .
A. she enjoys drinking tea
B. she is a designer
C. she think the tea bowl is too hot
D. she wants to improve the way people drink
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