下列行为中，（）属于《中华人民共和国预防未成年人犯罪法》所称的“严重不良行为”。 ["纠集他人结伙滋事，扰乱治安","打架斗殴、辱骂他人","传播淫秽的读物或者音像品等","携带管制刀具"]
声波的衰减与下列哪些因素无关？（） ["传播距离","声波频率","介质性能","规范"]
现代体育文化旨在谋求（） ["身体的培养和发展","增进健康和保持积极的心理、生理状态","维护社会稳定","发展体育理想"]
在超声波检测中，下列哪个频率的探头可获得相对最佳分辨率（） ["20kHz","30kHz","40kHz","50kHz"]
What is a characteristic of Network Time Protocol？（） ["NTP updates are sent in the timezone they are collected in，and the syslog server will adjust based on the input time.","NTP authentication verifies the source，not the recipient.","NTP authentication requires that the recipient has multiple strata clocks to ensure accuracy.","Secure NTP can be configured to use SHA-1 hashing，since NTP is very insecure.","A stratum 0 clock should be configured at the core of every network，so it can connect to an accuratetime source."]
亲爱的弟兄，不要自己（），宁可让步，听凭主怒（注：或作“让人发怒”）。因为经上记着：“主说：‘伸冤（），我必（）。
