问题 问答题 简答题

述焊缝形状对接头质量的影响?

答案

参考答案:

焊缝形状可分为两类:一类是窄而深的焊缝,此时柱状晶从两边向溶池中心成长,使焊缝中心偏析严重,低熔点共晶和杂质多,极易产生裂纹及引起强度变差。另一类是宽而浅的焊缝,柱状晶从底部向上生长,将杂质推向焊缝表面,对防止裂纹有利,且机械性能也强于前者。

单项选择题
单项选择题

Abortion. The word alone causes civil conversation to flee the room. This is largely because the pro-choice and pro-life positions are being defined by their extremes, by those who scream accusations instead of arguments.

More reasonable voices and concerns, on both sides of the fence, are given little attention.

For example, pro-life extremists seem unwilling to draw distinctions between some abortions and others, such as those resulting from rape with an underage child. They would make no exception in the recent real-life case of a woman who discovered in her fifth month that her baby would be born dead due to severe disabilities.

On the other hand, pro-choice extremists within feminism insist on holding inconsistent positions. The pregnant woman has an unquestionable fight to abort, they claim. Yet if the biological father has no say whatsoever over the woman’s choice, is it reasonable to impose legal obligations upon him for child support Can absolute legal obligation adhere without some sort of corresponding legal rights

The only hope for progress in the abortion dialogue lies in the great excluded middle, in the voices of average people who see something wrong with a young girl forced to bear the baby of a rapist.

Any commentary on abortion should include a statement of the writer’s position. I represent what seems to be a growing "middle ground" in pro-choice opinion. Legally, I believe in the right of every human being to medically control everything under his or her own skin. Many things people have a legal right to do, however, seem clearly wrong to me. adultery, lying to friends, walking past someone who is bleeding on the street. Some forms of abortion fall into that category. Morally speaking, my doubts have become so extreme that I could not undergo the procedure past the first three months and I would attempt to dissuade friends from doing so.

Fanatics on both sides are using reprehensible and deceitful tactics. An honest dialogue on abortion must start by re-setting the stage, by denouncing the approaches that block communication.

The author doubts the legal right to lie to friends as well as the one to ().

A. abort a fetus in its fifth month

B. view the photos of late-term abortion

C. give birth to a baby in one’s teenage

D. dispose of what ever under one’s skin