按成型过程中物理状态不同分类,可分为()。
参考答案:压缩模、压注模、注射模、挤出机头;气动成型
在(1)~(5)中哪一项技术改造投资最大( )
A.冲压生产线
B.焊接生产线
C.发动机箱体、箱盖生产线
D.发动机曲轴连杆生产线
During severe storms when survival becomes a major concern,it may become necessary to relieve high anchor tensions on the windward side of the unit by().
A.deballasting the rig
B.ballasting the rig
C.paying out cable on the windward side
D.paying out cable on the leeward side