如图,在地面上的点A处测得树顶B的仰角为α度,AC=7m,则树高BC为(用含α的代数式表示)( )
A:7sinα
B:7cosα
C:7tanα
D:7tanα
①—Who is he?
—He's my father.
②— Who is she?
— She is my grandmother.
③—Who is she?
—She's my mother.
④—Who is he?
—He's my grandfather.
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除数大于1,商就小于被除数.
96n是整数,则正整数的最小值是 ( )