题目内容

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.

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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。

电荷在静电场中沿任一闭合曲线移动一周，电场力做功为。电荷在磁场中沿任一闭合曲线移动一周，磁场力做功为。