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电压和电流关联参考方向时，欧姆定律表示为U=___________

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当电压和电流为非关联参考方向时，欧姆定律为：U=-IR

A. 对
B. 错

选词填空，必要时改变形式：routineprioritizeexcludesoundassumepatternexceedunique1. Following his parents' ___ advice, Dr. Francis developed an interest in science.2. That figure total foreign purchases in the first four months this year.3. It is wise to questions in your order of preference.4. All the manufacturers try to add something to set their devices apart.5. He exhibited nearly the same behaviour _ as his younger brother.6. It shouldn't take too long to get back to our old ___.

填句补文（请把正确答案对应选项的大写字母写在空格处）How to Start Your Own BusinessI have recently started a business and have learned some crucial lessons in the process that I feel privileged to share with you.1. Identify your motivation. 1 To have more time? To make more money? To be your own boss? To have creative control over what you love to do? Write out all of your motivating factors and prioritize them. When you see them listed, you might see a pattern in that you're just unhappy at your current job and starting your own business isn't the answer.2. Identify your passion. What do you love to do? What skills and knowledge do you uniquely bring to the table? What gets you excited about your work? 2 If you keep your passion in plain sight, you will stay focused on the purpose of your business and not solely on the logistics.3. Identify your market. If you are starting your business locally, research your competitors. Determine if there is room in the market for your business. What will you do differently to draw in customers? What niche market are the other businesses missing? 3 Your business cannot survive without customers, so do enough research on the front end to determine if there are enough potential clients to keep your business alive.4. Identify your finances. 4 You have to buy furniture, trash cans, a garage door opener, light fixtures and landscaping equipment, and before you know it, you've far exceeded your financial boundaries. That can happen just as easily in a business. Do exhaustive financial planning. Meet with a financial advisor or someone at your bank to examine the financial viability of your business and the process of getting it up and running. 5 Be prepared for financial loss and get advice on how to alleviate that burden in the future.A．Plan wisely and do not assume the best about your business.B．Why do you want to start your own business?C．The tragic reality is that when business fail, the passion often dies with it.D．Keep that passion at the forefront of your business plan, your marketing strategies, and your daily routine.E．If you have ever purchased a new home, you know that the financial obligations extend beyond the down payment and the mortgage.F．If you are starting an Internet company, research the requirements for your own unique Web presence.

设无向图G有10条边，3度与4度顶点各2个，其余顶点的度数均小于3，则G中至少有几个顶点.

A. 6
B. 7
C. 8
D. 9