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【单选题】
There are _______ days in a year. A. three hundred sixty-five B. three hundreds sixty-five C. three hundred and sixty -fiveA.
three hundred sixty-five
B.
three hundreds sixty-five
C.
three hundred and sixty -five
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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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