【单选题】若∠AOB=60°,∠AOC=30°,则∠BOC为( )
【单选题】Mary ______ at the bus stop for about an hour when Tom finally came and started to argue about what ______ before.
B.
have waited, has happened
C.
had waited, was happened
D.
had been waiting, had happened
【单选题】下列等式中成的有( ) ①sin30°+sin30°=sin60°;②若cosA=sinB,则∠A=∠B;③若sinA=cos30°,则锐角A=60°;④sin60°+sin30°=2(sin30°+cos30°).
【单选题】It was (acted starred started) by Tom Cruse and Renee Zellewager.
【判断题】android:pivotX: 缩放起点X轴坐标,可以是数值、百分数、百分数p
【单选题】With everything ________, the teacher started the slide show.
【单选题】已知∠AOB=3∠BOC,若∠BOC=30°,则∠AOC等于( )