根据下列资料编制直线回归方程r=0.9a=2.8（）
A. 直线回归方程yc=2.8+1.08x
B. 直线回归方程yc=2.8+1.18x
C. 直线回归方程yc=0.9+1.08x
D. 直线回归方程yc=0.9+1.18x
拆除轻型结构屋面时，不得（）屋面上，应使用移动板或梯子，并将其上端固定牢固。
What is a rotating item?（）
A rotating item is an individual item that is defined with a common item number. An item is designated as rotating because one wants to be able to create individual asset records by using the information (Classification, Specification,and Item Assembly Structure) contained on the item record.
B. A rotating item is a set of items that are defined with a specific code. An item is designated as rotating because one does not want to be able to create individual asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the item record.
C. A rotating item is a set of kits that are defined with a specific description and GAn item is designated as rotating because one has the single cost to manage prefers to be able to create individual asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the assembly record.
D. A rotating item is an individual item that is defined with a common item number and can be a spare part. An item is designated as rotating because one wants to be able to create multiple asset records by using the information (Classification, Specification, and Item Assembly Structure) contained on the item set records.
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