概算定额是以扩大分项工程或扩大结构构件作为对象编制的，是一种计价性定额。( )
参考答案：对
He got lost in the forest because he didn't _____. [ ]
A. keep to the path
B. lead the way
C. hurt himself
D. worry about
下列（）与陀螺罗经的速度误差无关。
A．航速
B．航向
C．船舶所在纬度
D．罗经结构参数
