在△ABC中,若∠B+∠C=3∠A,则∠A=______.
∵∠A+∠B+∠C=180°,∠B+∠C=3∠A,
∴4∠A=180°,
∴∠A=45°,
故答案为:45°.
It's suggested that some activities ________ to celebrate the 30th anniversary of the Reform and Opening up.
A.should hold
B.are held
C.be held
D.will be held
于铁路运输常识,说法不正确的是()。
A.D字开头为动车组列车
B.一般旅客可携带不超过500毫升的酒精
C.客票有效期按乘车里程计算
D.列车开车一小时后卧铺仍无人使用时,列车长可将该铺另行出售