某小组有5名男生,6名女生,从中任选一名学生去听讲座,则不同的选法种数是( )
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Listen to the following transmissions and fill in the blank with missing words.Confirm we are being vectored to fly _______the airport for right downwind.
Listen to the following transmissions and fill in the blank with missing words.If we continue to make orbits we will ____________________by the time we land.
Listen to the following transmissions and fill in the blank with missing words.Request the longest runway and vectors for a ____________
对半径为R载流为I的无限长直圆柱体,距轴线r处的磁感应强度
A. 内外部磁感应强度
B. 都与r成正比;(B)内部磁感应强度B与r成正比,外部磁感应强度B与r成反比;
C. 内外部磁感应强度B都与r成反比;
D. 内部磁感应强度B与r成反比,外部磁感应强度B与r成正比。