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【多选题】
有关神经调节的叙述正确的是A.
反应速度慢
B.
参与维持机体的稳态
C.
作用范围广
D.
持续时间短
E.
反应迅速而准确 ！
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皮皮学刷刷变学霸
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【单选题】The direct object in 'The coach taught his apprentices some safety knowledge before they drove' is ______.
A.
his apprentices
B.
some safety knowledge
C.
the coach
D.
before they drove
【简答题】There are some important safety rules that must follow in case of an emergency or a sudden illness.
【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)
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