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搜题
【多选题】
( )是构成建筑安装工程费的主体,在水利工程总投资中占有很大的比重。A.
人工费
B.
间接费
C.
材料费
D.
施工机械使用费
E.
利润
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Buoys are marked with reflective material to assist in their detection by searchlight.Which statement is TRUE ().
A.
A safe-water buoy will display red and white vertical stripes of reflective material
B.
All reflective material is white because it is the most visible at night
C.
A special-purpose mark will display either red or green reflective material to agree with its shape
D.
A preferred-channel buoy displays either red or green reflective material to agree with the top band of color