【简答题】如图△ABC中,∠C=90°,∠A=30°,B C=5cm;△DEF中∠D=90°,∠E=45°,DE=3cm.现将△DEF的直角边DF与△ABC的斜边AB重合在一起,并将△DEF沿AB方向移动(如图).在移动过程中,D、F两点始终在AB边上(移动开始时点D与点A重合,一直移动至点F与点B重合为止). (1) 当△DEF移动至什么位置,即AD的长为多少时,E、B的连线与AC平行. (2) 在△DE...
【简答题】如图,在△ABC中,∠C=90°,∠BAC=30°,将△ABC绕点A逆时针旋转,使得C点落在AB上的C 1 处,则∠BB 1 C 1 = °
【简答题】(1)在△ABC中,若∠A=70°,∠B=45°,则∠C=______°. (2)在△ABC中,若∠A=30°,∠B=∠C,则∠B=______°.
【简答题】1在△ ABC 中,∠ A=30 °∠ B=52 °,则∠ C=_______ 2在△ ABC 中,∠ A+ ∠ C =115 °则∠ B =________
【简答题】— What do you usually do in your spare time? — _________________. A: Yes, it’s my favorite time B; No, I'll never do that C; Reading
【判断题】在纯电阻电路中,电流与电压的有效值满足欧姆定律。
【简答题】选择合适的句子,补全对话。 ① Sometimes I clean my room. ② What can you do? ③ What's the date? ④ What do you do on the weekend? ⑤ What time is it? ⑥ What about you? ⑦ Which season do you like best? A: _____________...
【单选题】----______? ----My clothes are out of style.
【单选题】I will never forget such a beautiful village __________ I spent my childhood there with my grandparents.
【简答题】Women
must fight for the right _____ equal pay for equal work.