选择题：签到经纬度要与站址经纬度偏差在( )度以内。()

砼强度等级为C25的基础回弹值是。()

社会历史条件对历史人物产生所起的作用有( ) A.呼唤英雄B.锻炼英雄C.筛选英雄D.创造英

Which of the following problems could cause the high pressure cutout switch to shut down t

混凝土回弹仪的测量对象是混泥土的。()

[A]reduce [B]narrow [C]dwarf [D]shrink