【单选题】The direct object in 'The coach taught his apprentices some safety knowledge before they drove' is ______.
【简答题】There are some important safety rules that must follow in case of an emergency or a sudden illness.
【单选题】药品管理法律体系按骃法律效力等级由高到低排序,正确的是
【单选题】In some type of two-stroke engines, besides some small holes for , starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the .
A.
fuel valves; exhaust valve
B.
exhaust valves; inlet valve
C.
fuel valves; inlet valve
D.
exhaust valves; fuel valve
【简答题】已知甲企业工人数和工资资料如下: 月工资(元) 工人数(人) 450 540 670 860 900 20 105 110 20 15 合计 270 又知,乙企业的平均工资为653元,工资的标准差为127.5元,试分析比较哪个企业的平均资更具有代表性?(10分)
【多选题】以下哪些对象由Servlet容器创建( )。
【判断题】均一电网功率的经济分布与其功率的自然分布相同。()