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【单选题】
______, but he also proved himself a good athlete.A.
He showed himself not only a good student
B.
He showed not only a good student
C.
Not only did he show himself a good student
D.
Not only he showed himself a good student
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【简答题】“美术字文本”是怎样进行换行的: 。
【单选题】如自测图4-2所示电路，其中V，调节电容C使电流i与电压u同相，此时测得电感两端电压为200V，电流I＝2A。则电路中R为（ ），当频率下调为f0/2时，电路呈（ ）性质。
A.
50Ω，感性
B.
50Ω，容性
C.
10Ω，感性
D.
10Ω，容性
【简答题】如图所示的电路中，已知C=0.01uF，输入电压 u[ i =10\sqrt{2}sin(ωt)V ]，f=1200Hz。试求：
【单选题】When he was in the countryside， he __________ visit the poor peasants．
A.
used to
B.
was used to
C.
is used to
D.
had used to
【简答题】阅读理解。 When George was young, he played a lot of s, and he was thin and strong. But when he was about 45, he began to become fat. He couldn't breathe well. And when he walk fast, his heart painfu...
【单选题】—He’s stopped from smoking , ________he? —Yes, he ________ stopped smoking.
A.
hasn’t , is
B.
isn’t , is
C.
isn’t , has
D.
has, is
【单选题】当细胞癌变时,其表面发生的变化是:
A.
HLA-Ⅰ类抗原显著减少
B.
HLA-Ⅰ类抗原显著增加
C.
HLA-Ⅱ类抗原显著减少
D.
HLA-Ⅱ类抗原显著增加
E.
都减少
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