可变荷载的标准值由数理统计方法确定，通常要求有()的保证率。
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What started the move towards supersizing in the fast food industry？
After inducing people to overeat.
B. The rise of the "heavy users".
C. Studies identifying the heavy user.
D. When price slashing occurred.
The author is convinced that accent is______.
A. something we are born with
B. something that cannot be changed by people easily
C. something we cannot speak without unless we are acting
D. something we adopt from the current group with which we reside
浓度克拉克值是元素在某一地质体中的平均含量与该元素克拉克值的比值。()
ieee802.3标准的以太网的物理地址长度为64bit。()
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