问题
问答题 简答题
为什么塑件要设计成圆角的形式？
答案
参考答案：
塑件的尖角部位在成型时会产生应力集中，当受到冲击振动时易开裂，塑件设计成圆角，不仅避免产生应力集中，提高了塑件强度，还有利于塑件的充模流动，同时模具型腔对应部位亦呈圆角，这样使模具在淬火和使用时不致因应力集中而开裂，提高了模具的坚固性。
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为什么塑件要设计成圆角的形式？
参考答案：
塑件的尖角部位在成型时会产生应力集中，当受到冲击振动时易开裂，塑件设计成圆角，不仅避免产生应力集中，提高了塑件强度，还有利于塑件的充模流动，同时模具型腔对应部位亦呈圆角，这样使模具在淬火和使用时不致因应力集中而开裂，提高了模具的坚固性。
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。 A beautiful girl was shopping with her mother in Blue-sky Market. It was 31 hard outside. Many people all stood there under the awning (遮雨蓬). They waited, some patiently, others impatiently because of the bad weather. The girl’s32 was so sweet. “Mom, let’s run through the rain,” she said suddenly. “What?” Mom asked. “Let’s run through the rain!” “No, Honey. We’ll 33 until it slows down a bit,” Mom replied. The child waited about another 34 and repeated, “Mom, let’s run through the rain.” “We’ll get 35 if we do,” Mom said. “No, we won’t, Mom. That’s not what you said this 36,” the young girl said as she tugged (拽) at her mom’s arm. “This morning? 37did I say we could run through the rain and not get wet?” “Don’t you 38? When you were talking to Daddy 39 his cancer, you said, ‘If God can get us through this, he can get us through 40!’” The people became 41. Nothing could be 42 but the rain. Mom thought for a moment about what she would say. “Honey, you are 43. Let’s run through the rain.” 44 they ran off. People all stood watching, smiling and laughing as they 45 past the cars and through the puddles (水坑). They 46 their shopping bags over their heads. They got wet through, but they were 47by a few who laughed like children all the 48 to their cars. People can 49 your money and health, but no one can ever take away your memories. So, don’t 50 to make time to make memories every day.
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