【单选题】在△ ABC 中,若 a = 4 , b = ,∠ 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】II. Fill in theblanks with proper words: (A) Dear Sirs , You wererecommended to us by London Chamber of Commerce. We are _____ in your leatherboots. We are wholesalers in the North of England and we t...
【单选题】在△ABC中,若a=4,b= ,∠A=30°,则∠B= ( )
【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( )
【简答题】Task I 请翻译下列商务信函常用语句。 1. We should be glad to hear at your earliest convenience the terms and conditions on which you are prepared to supply. 2. We have seen your advertisement in the Business World a...