题干

在mA+nBpC的反应中m、n、p为各物质的化学计量数,现测得C每分钟增加a mol·L-1,B每分钟减小1.5a mol·L-1,A每分钟减少0.5a mol·L-1,则m:n:p为

A:2:3:2

B:2:2:3

C:1:3:2

D:3:1:2

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C

同类题1

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    My father was always a good gardener. One of my earliest memories is standing without shoes in the freshly tilled soil, my hands blackened from digging in the ground.

    As a child, I loved following Dad around in the garden. I remember Dad pushing the tiller(耕作机) ahead in perfectly straight lines. Dad loved growing all sorts of things: yellow and green onions, watermelons almost as big as me, rows of yellow corn, and our favorite — red tomatoes.

    As I grew into a teenager, I didn't get so excited about gardening with Dad. Instead of magical land of possibility, it had turned into some kind of prison. As Dad grew older, his love for gardening never disappeared. After all the kids were grown and had started families of their own, Dad turned to gardening like never before. Even when he was diagnosed with cancer, he still took care of his garden.

    But then, the cancer, bit by bit, invaded his body. I had to do the things he used to do. What really convinced me that Dad was dying was the state of his garden that year. The rows and rows of multicolored vegetables were gone. Too tired to weed them, he simply let them be. He only planted tomatoes.

    For the first few years after he died, I couldn't even bear to look at anyone's garden without having strong memories pour over me like cold water from a bucket. Three years ago, I decided to plant my own garden and started out with just a few tomatoes. That morning, after breaking up a fair amount of soil, something caught the corner of my eye and I had to smile. It was my eight-year-old son Nathan, happily playing in the freshly tilled soil.

同类题5

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    Amsterdam is most famous for its artistic heritage. This tradition is proudly on display in the Rijksmuseum (translates as State Museum). Once you've taken in all that has to offer, artists, history fens, and families shouldn't pass up the chance to visit the Van Gogh Museum —containing around 700 paintings and drawings by Vincent and other artists, including Gauguin, Monet, and Toulouse-Lautrec.

    Amsterdam is also home to the Anne Frank Museum, where Anne hid with her family during the Nazi occupation of the Netherlands. On a lighter note, taking a canal cruise through its extensive waterways is a rewarding way to see the Dutch capital.

Art lovers get their tickets at:

    The Van Gogh Museum Rijksmuseum Museum het Rembrandthuis

Food and drink

    Cheese lovers love Amsterdam. You can find an excuse to eat cheese at any time of the day here. Gouda is Holland's favorite, developing a more intense flavor the longer it's aged. Find a selection at the markets, try a cheeseboard at dinner time, or just order cubes with mustard for dipping to accompany a drink. When you're hungry for non-cheese food groups, you'll find Michel in-starred restaurants, vegetarian, and organic restaurants that accompany an array of global cuisine. For old-fashioned and modern Dutch food, try these Amsterdam restaurants: Moeders, Haesje Claes, Loctje, Greetje, and De Silveren Spiegel.

Don't leave without tasting:

    Patat (hot chips with toppings), Stroopwafel (waffle cookie), Chocomel (chocolate milk)

    Amsterdam Fast Facts

    Approximate flight times:

    NYC/ New York 7 hours 20 minutes, Philadelphia 8 hours, Boston 7 hours

    Miami 9 hours 45 minutes, Los Angeles 10 hours 15 minutes