确诊多发性骨髓瘤，需下列哪一项检查（）
A.MRI增强扫描
B.CT增强扫描
C.核素扫描
D.骨髓穿刺活检
E.尿常规
参考答案：D
Both of _______ heard a loud noise .It was _______ thunder.
A．us ; like
B．us ; likes
C．we ; like
D．us likes
典型的总线型局域网是（）。
A.以太网
B.令牌环形网
C.无线传感网
D.Internet
