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提问人:网友13***556 发布时间:2022年5月1日 23:10
[单选题]

电路如图所示。U2=20V,C=1000μF,RL=40Ω。正常情况下,UO=()。

A. 24V B. 28V C. 9V D. 18V

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The Organized Traveller’s Checklist Here’s a step-by-step guide to accomplishing the essentials in the weeks, days, and hours before you leave on vacation.Eight Weeks Ahead · If you’re going out of the country and don’t have all of the documents you need--whether passports or original birth certificates--now is the time to get them. If it looks like the documents may not arrive until the last minute--or even late--show your airline tickets to personnel at the government agencies from which you’re requesting documents. Ask them to put a rush on your application. · If you’re traveling abroad, contact a travel health specialist (your health-care provider may have a travel department, or your doctor may be able to recommend a specialist), or contact your local health department to ask about immunizations and preventive medicines. · When it comes to what to take with you--be it luggage, sports equipment, camping gear, or clothing--now’s the time to assess your needs. You can save shopping time and hassle by buying from catalogs: order now so purchases will arrive before your departure date.Six Weeks Ahead · If you don’t belong to an auto club and are about to use your car on a trip, join a club now so you can take advantage of member benefits. These usually include trip-planning services, maps, guidebooks, discounts at accommodations and attractions, and roadside emergency help. · Join an airline’s frequent-flier program too--it’s free. Make sure the names on your tickets and on membership forms are identical, or you won’t get mileage (英里里程)credit for your flights. Give frequent-flier numbers to your travel agent.Four Weeks Ahead · Airline seats are generally assigned and confirmed 30 days prior to departure, so call now to get your desired seat assignments and to make certain your family is seated together. Another call to make is to a kennel (养狗场) or other facility if you plan to board a pet during vacation. · Buy any home security and automation (自动操作)devices you’ll need. These might include timers for lights and TVs, an alarm system, automatic plant-watering systems, and pet feeders. Figure out how they work now so you won’t be scrambling to set them on the day of departure. · If anyone in your family wears glasses or contacts, order a spare pair today so they’ll be ready by the time you go. At the very least, get an up-to-date prescription so you can take it to a quick-service optical store if glasses are lost or broken. If you need prescriptions or checkups, make those appointments now.Two Weeks Ahead · Write down your doctors’ and. pharmacist’s phone numbers in case you need information on the road. If you’ll be driving your own car, have a reliable mechanic check it from top to bottom. · Plan the route now: Do it yourself with good maps and trip-planning software, or use your automobile club’s trip-planning service. Clubs like the American and Canadian Automobile Associations (AAA and CAA) require two weeks’ notice to provide this service to members. · You will want to carry a moderate amount of cash, as well as traveler’s checks and credit or debit cards. Automated teller machines (ATMs) are handy because you don’t have to take as much cash with you, but check with your bank to see if there will be ATMs where you’re going. Buy the traveler’s checks now, and be sure to keep the records detailing check numbers separate from the checks themselves. · Check camera equipment. Buy fresh batteries and more film than you think you’ll need. Resort-area stores charge premium prices for cameras and film.One Week Ahead · No need to pack yet, but get everything ready. 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A.One month before the traveling.B.One week before the traveling.C.One day before the traveling.D.Ten hours before the traveling.
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