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【简答题】
用所给词的适当形式填空 1) He just arrived as I (answer) the phone. 2) Tom (be) ill last week, he (be) much better now. 3) We (be) disappointed if there is no snow for Christmas. 4) Jimmy and his sister (be) here two days ago. 5) They (leave) for Beijing yesterday. 6) His hair is long , he (have) a haircut tomorrow. 7) He (have ) a bath when the telephone (ring). 8) I (cook ) the dinner while he (read) the paper. 9) I (be) hungry since five o’clock this morning. 10) He usually (get) up at 6 o’clock in the mor n ing, but he (have) to get up very early yesterday this morning, because he wanted to catch a train.
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【单选题】若【图片】采样频率为256Hz，N＝512点。若加矩形窗傅里叶变换后，显示的振幅值为 mm。
A.
95.5
B.
256.0
C.
96.0
D.
100.0
E.
67.7
【简答题】DIC是以 功能紊乱为特征的病理过程。
【单选题】若【图片】采样频率为256Hz，N＝512点。傅里叶变换后在幅频曲线中的频率间隔Df＝ Hz。
A.
105.5
B.
256.0
C.
0.5
D.
100.0
E.
99.9
F.
2.0
【单选题】若【图片】采样频率为256Hz，N＝512点。若加平顶窗经傅里叶变换后在幅频曲线中显示的振幅为 mm。
A.
105.5
B.
256.0
C.
0.5
D.
100.0
E.
99.9
F.
2.0
【简答题】室温是指(__), 阴凉处是指(__), 凉暗处是指(__),冷处是指(__)。
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