问题 选择题
如图所示,矩形线圈有N匝,长为a,宽为b,每匝线圈电阻为R,从磁感应强度为B的匀强磁场中以速度v匀速拉出来,那么,产生的感应电动势和流经线圈中的感应电流的大小应为(  )

A.E=Bav,

B.E=NBav,

C.E=Bav,

D.E=NBav,

答案

答案:D

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.

According to the pro-choice position, ().

A. a pregnant woman cannot abort her baby if its father agrees to keep it

B. a pregnant woman has an absolute right of choice over an abortion

C. the baby’s father also has a say over its mother’s choice of abortion

D. the baby’s father has an unalienable obligation to support the baby

判断题