2016年7月1日实施的GB7588-2003《电梯制造与安装安全技术规范》国际标准第1号修改单主要内容包含( )
A. 增加了轿厢意外移动的检测保护功能;
B. 增加了轿门的保护功能(即加装轿门锁);
C. 增加了对短接门锁回路行为的检测功能要求;
D. 增加了层门及其门锁的质量要求;
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( ) dies are the least complex of the moulds
A. casting
B. extrusion
C. injection
( ) moulding is the most complex of the moulding processes.
A. injection
B. casting
C. extrusion
Injection moulding is well suited for ( )
A. thick-walls parts
B. connecting rods
C. plastic bottle
In principle, pressture casting is identical to ( )
A. extrusion moulding
B. injection moulding
C. compression moulding