问题
单项选择题
梯度回波序列的主要优点是
A．提高图像信噪比
B．提高空间分辨率
C．增加磁场均匀性
D．提高成像速度
E．减少噪声
答案
参考答案：D
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梯度回波序列的主要优点是
A．提高图像信噪比
B．提高空间分辨率
C．增加磁场均匀性
D．提高成像速度
E．减少噪声
参考答案：D
阅读下面短文，掌握其大意，然后从36至55各题所给的四个选项（A、B、C、D）中, 选出最佳选项，并在答题卡上将该项涂黑。 As a father, I greatly valued the moments 36 my son and I could be together, and that day was really special. Louisville, Kentucky was a place where basketball was an important part of life, and 37 taking my son to an NBA exhibition game was one of those special moments. But little did I realize how special that evening was going to be! It was blowing some mean wind. Josh 38 my hand as we crossed the parking lot and 39 for the famous Freedom Hall. 40 eight years old, he still felt it was okay to hold his father’s hand, and I felt grateful, knowing that this kind of moments would pass 41 . The stadium 42 nineteen-thousand-plus fans, and it definitely looked like a sellout(客满的).The expectation of seeing Mrhael Jordan and the Chicago Bulls 43 the Washington Bullets 44 our pace across the parking lot, thinking about 45 the game was going to go. The tumstile(十字转门)clicked and Josh hung on to his souvenir ticket stub (票根）like he had just won the lottery! We pushed our 46 to the upper-level seats of the “true” fans. Before we know it, the game was 47 way. During a time out, we dashed to 48 hot dog and Coke and rushed back so that we 49 miss a single part of the game. Things were going as expected until halftime. I started to talk to some friends 50 when there was a pull on my sleeve, my arm was pulled over by a 51 young Josh, and he began putting a multicolored, woven yarn bracelet(丝织手獨）around my wrist. It 52 really well, and he was really focused attentively as he carefully made a double square knot to keep it secure. On this special 53 I realized the significance of the moment. With a smile, I told him proudly how I knew this was a “friendship brardet” and said, “I guess this means we are 54 ” Without missing a beat, his big brown eyes looking me straight in the face, he exclaimed, “We’re 55 friends. You’re my dad!”
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