问题
选择题
如图所示为一磁流体发电机示意图,A、B是平行正对的金属板,等离子体(电离的气体,由自由电子和阳离子构成,整体呈电中性)从左侧进入,在t时间内有n个自由电子落在B板上,则关于R中的电流大小及方向判断正确的是( ) A.I= B.I= C.I= D.I= ![]() |
答案
答案:A
如图所示为一磁流体发电机示意图,A、B是平行正对的金属板,等离子体(电离的气体,由自由电子和阳离子构成,整体呈电中性)从左侧进入,在t时间内有n个自由电子落在B板上,则关于R中的电流大小及方向判断正确的是( ) A.I= B.I= C.I= D.I= ![]() |
答案:A
从右栏中找出能够与左栏相配的句子,把序号填在横线上。 | ||
A man goes to a fast-food restaurant for lunch. "Hi," a worker says, "May I help you?" "I'd like a hamburger, large fries, and a medium Coke." the man says. "Anything else?" the worker asks. "No." the man answers, "That's it." "Is that for here or to go?" the worker asks. "To go." the man says. The man pays for his lunch. The worker puts the man's lunch in a bag. The man takes the bag. | ||
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