肋的布置方向最好与熔料流动方向()。
A 垂直
B 成300角
C 成600角
D 一致
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注塑模具零件可以分()两类。
A导向零件和成型零件
B结构零件和导向零件
C顶出零件和导向零件
D成型零件和结构零件
注塑机锁模力应该()注射压力乘以制品成型面积。
A大于
B等于
C小于
D其他
The coastguards came out to help the author because
A. they discovered the author capsized his catamaran.
B. the author encountered a big whale.
C. they had lifesaving obligation.
D. they were well-meaning people.
喷嘴的温度应该()料筒的最高温度。
A等于
B低于
C高于
D不影响
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