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问题 多项选择题

作为经济补偿制度的保险，必须具备如下（）条件方可形成。

A.可保危险的存在

B.多个经济单位的结合

C.单个经济单位的结合

D.随机事件的科学化

E.必然事件的科学化

答案

参考答案：A, B, D

单项选择题

（2012）质量为110kg的机器固定在刚度为2×106N/m的弹性基础上，当系统发生共振时，机器的工作频率为：（）

A.66.7rad/s

B.95.3rad/s

C.42.6rad/s

D.134.8rad/s
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填空题

Paulie Theatre
Name of the show：Dance of the Soul
Date：19:30，March 2
Number：16，Row 9，1st F
Price：80
Children below 1.2M are not allowed to enter the theatre．Children above 1.2M should enter with tickets only．
Please check the date and seat number when you buy your ticket．Onee the ticket has been sold out，there is no refund(退票)．
No smoking in the theatre．Dangerous things are not allowed in the theatre．Sometimes a security check is necessary．
The use of cameras．videos and tape recorders are not allowed in the theatre．
Please turn off your mobile phones or set them to vibration mode．
Please check your seat number and be seated before the performance begins．If you arrive after the show begins，please wait outside the performance hall，enter quietly into the hall during the interval and take a free seat．

What is prohibited in the theatre
The use of mobile phones，videos and______are forbidden in the theatre．
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