建设项目单价合同可分为( )。
A.综合单价合同和可调单价合同
B.工料单价法和综合单价法
C.估计工程量单价合同和纯单价合同
D.可调单价合同和成本加酬金合同
参考答案:C
At all angles of inclination,the metacenter is().
A.vertically above the center of buoyancy
B.vertically above the center of gravity
C.at the intersection of the upright vertical centerline and the line of action of the buoyant force
D.at the geometric center of the underwater volume
氨泵柱塞大量冒氨的原因?