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问题 单项选择题

男性，40岁，2个月来左颈部淋巴结进行性肿大，无痛，周期性发热，消瘦，近一周上胸部水肿，颈粗，淋巴结活检有里-斯细胞，X线胸片示纵隔有肿块，选择哪种治疗显效最快（）

A.MOPP

B.苯丁酸氮芥

C.放射治疗

D.肾上腺皮质激素加长春新碱

E.多柔比星

答案

参考答案：A

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单项选择题

5MHz的脉冲通过2cm的软组织后，会衰减多少分贝(dB.)

A．7dB.
B．3.5dB.
C．2.7dB.
D．3.75dB.
E．1.75dB.
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