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乌丢丢离开珍儿家跳上了一辆大马车离开了。
When a student said in class,"I come home at 6 o' clock yesterday", the teacher said "Came not come". Which rule of effective feedback does the teacher NOT obey?
设某厂生产的一种灯管的寿命X~N（μ40000），从过去较长一段时间的生产情况来看，灯管的平均寿命μo=1500小时，现在采用新工艺后，在所生产的灯管中抽取36只，测得平均寿命x=1675小时，问采用新工艺后，灯管寿命是否有显著提高？
填画车站技术作业图表时，计划线中货物列车为黑铅笔线，旅客列车为红色线。
女性，38岁，活动后心悸，气促，呼吸困难，乏力3个月入院。体查：血压100／85mmHg，半坐卧位，心界不大，心尖搏动不明显，心率110次／分，可闻心包叩击音，双肺呼吸音粗，无干湿性啰音，颈静脉怒张，肝肋下3cm，肝颈阳性，腹腔积液征（+++），双下肢水肿（+），拟诊缩窄性心包炎。诊断缩窄性心包炎，最有意义的检查项目是（）
行驶车速
《仪器和观测方法指南6版》：测站的坐标是（）.
在日常燃气使用中，描述错误的是（）
道岔基本轨垂直磨耗，60kg/m及以上钢轨，在其他站线上超过（）时，应及时修理或更换。
某边坡剖面如图6.2.4.6所示，挡墙为梯形截面，墙高为6.0m，墙背填土表面倾角为30°，填土内摩擦角30°，内聚力25kPa，填土重度为20kN/m3，填土与墙背摩擦角为10°，墙背倾角为70°，稳定岩石坡面倾角为50°，岩石坡面与填土间摩擦角为12°，该挡墙单位长度上的主动土压力合力标准值为（）。
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