【单选题】在△ABC 中,若a=4,b=4 ,A=30° 则B 等于
【单选题】下列说法正确的是( )
A.
在Rt△ABC中,若tanA= 3 4 ,则a=3,b=4
B.
在△ABC中,若a=3,b=4,则tanA=15
C.
在Rt△ABC中,∠C=90°,则sin 2 A+sin 2 B=1
D.
tan75°=tan(45°+30°)=tan45°+tan30°=1+ 3 3
【简答题】Choose the right answers. A. that would suit your purpose very well B. Although costs have been rising since March C. enclose a copy of our latest illustrated catalogue and current price list D. We th...
【多选题】I ____ an illustrated supplement to our catalogue covering the latest designs which are now available from stock.
【单选题】I ____ an illustrated supplement to our catalogue covering the latest designs which are now available from stock.
【单选题】一摩托车以36km/h的 速率在地面上行驶。其轮胎与地面间的摩擦系数 为0.3 。则 摩托车在转弯时轨道的最小曲率半径为( )m。
【单选题】We are enclosing our ______ catalogue, price list giving the details you ask for.
【单选题】在△ABC中,若a=4, ,A=30°,则B等于( )