常规胸椎侧位摄影通常难以清晰显示哪些椎体
A.第1—2胸椎B.第3—4胸椎C.第5—6胸椎D.第7—8胸椎E.第9—10胸椎
参考答案:A
解析:第1、2胸椎因肩部重叠不能显示。
The teacher suggested that her students__________experiences with ESP.
A.write a composition on their
B.to write composition about the
C.wrote some compositions of his or her
D.had written any compositions for his
当有调制信号脉冲输出时,中心载频f0向上偏移时,即f0+△f叫()。