日本的源学产生于？（） ["八世纪末","九世纪末","十世纪末","十一世纪末"]
制动加速度绝对值一般不大于（）m/s2。必要时可增设减速制动器。 ["2.0m\/s2<\/sup>","3.0m\/s2<\/sup>","4.0m\/s2<\/sup>","5.0m\/s2<\/sup>"]
《幼儿园工作规程》规定，寄宿制幼儿园中的幼儿每日的户外活动时间不得少于（）。 ["4.5小时","4小时","3.5小时","3小时"]
中国编辑出版事业的缺憾有？
which command allows you to verify the encapsulation type CISCO OR IETF for a frame relay link?（） [" show frame-relay map"," show frame-relay lmi"," show inter serial"," show frame-relay pvc"]
幼儿园教育活动实施的原则有哪些？
