决策方案评估的标准包括()。
A.效益标准
B.方案协调性标准
C.方案适应性标准
D.方案力度标准
参考答案:A, B, C, D
基轴制中,间隙配合的基本偏差为()
A.孔为A~H
B.轴为a~h
C.轴为h
D.孔为A~H和轴为h
A virtual rise in the center of gravitty may be caused by().
A.filling a partially tank
B.using an on board crane to life a freely swinging heavy object
C.emptying a partially filled tank
D.transferring ballast from the forepeak to the after peak