如图1,在△ABC中,AB=AC,射线BP从BA所在位置开始绕点B顺时针旋转,旋转角为α(0°<α<180°)(1)当∠BAC=60°时,将BP旋转到图2位置,点D在射线BP上.若∠CDP=120°,则∠ACD___∠ABD
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∵∠ACB=120°,∠APB=60°,∴A、P、B、C四点共圆,∴当PB是圆的直径时最长,∴∠PAB=90°,∴∠ABP=30°.过点C作AB的垂线交PB于点O,则点O即为圆心,∵∠ACB=120°且AC=BC=4,∴∠BCO=60°,∠ACB=30°,∴∠OBC... 先根据∠ACB=120°,∠APB=60°得出A、P、B、C四点共圆,故当PB是圆的直径...
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C. 在飞行高度层FL100 上有中度的山地波和强颠簸,强度没有变化 查看完整题目与答案 重要气象情报(ZBAA SIGMET 6 VALID 120600/121000 ZBHH─ ZBHH FIR FZRA(SEV ICE) FCST ATFL180 40 DEG N 112 DEG E WKN =)所描述的重要天气出现的地区是 A. ZLLL 飞行情报区中北纬40°、东经112°的地方; B....
功能数量:1最高工作温度:100 °C 最低工作温度:-40 °C光电设备类型:PIN PHOTODIODE 峰值波长:880 nm最长响应时间:2e-8 s 最小反向击穿电压:20 V最大反向电压:20 V 半导体材料:Silicon形状:RECTANGULAR 子类别:Photo Diodes表面贴装:YES 端子面层:Tin/Nickel (Sn/Ni)Base Number Matches:1 ...
1.解:(1)如图1,连接BD,DE,四边形ABCD是平行四边形∴AB∥CD AB=CD,∴∠BCD=180°-∠ABC=180°-120°=60° ,∵BC=2AB ,点E是BC的中点, ∴BE=CE=CD ,△CDE是等边三角形∴DE=CE=BE ,∠CDE=∠CED=60°, ∴∠CBD=∠BDE=30° ,∴∠BDC=90° , ∵CD=AB=5 , ∴BC=10 , BD=√(BC^2-...
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GBJ1508-BP 价格参考8.75。AMI GBJ1508-BP 封装/规格:位置传感器,SENSOR ANGLE 360DEG SMD。 你可以下载GBJ1508-BP中文资料、引脚图、Datasheet数据手册功能说明书,资料中有 二极管 - 桥式整流器 详细引脚图及功能的应用电路图电压和使用方法及教程。
suspensions of seed-infecting hemibiotroph,F. graminearum,the OsACBP5-OEs exhibited 80–100% of seed germination rates, whereas those of WT and vector-transformed controls were 20% and 40%, respectively, suggesting that OsACBP5-OEs were more resistant toF. graminearuminfection (Fig.2C,D). ...