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【判断题】
按照2008《河北省建筑、安装、市政、装饰装修工程费用标准》，规费计费基数中，直接费中的人工费、机械费按照各专业消耗量定额规定的人工、机械消耗量及基期价格计算。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】The teacher asked her,"Does the sun rise in the east?" The teachet asked her ___ the sun ___ in the east.
A.
if; rise
B.
if; rises
C.
whether; rose
D.
whether did; rise
【简答题】The three-dimensional vector r , which has positive components, has magnitude 1 and makes angles of with each of the unit vectors i and j . The angle between r and the unit vector k is ° .
【单选题】Which best defines the normal vector
A.
A vector that is perpendicular to the surface at a given point
B.
A vector that is parallel to the tangent plane at a given point
C.
A vector that lie in the tangent plane but perpendicular to the viewing direction
D.
A vector that is always perpendicular to the viewing direction
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