下列哪项不是对骨质疏松症患者行X线检查时见到的（）
A.骨皮质变薄
B.骨小梁减少
C.骨小梁透明度变小
D.骨变形
E.骨折
参考答案：C
“39 Steps”is one of the most exciting films_________ directed by my brother.
A．which were
B．which was
C．that was
D．that were
以太网网卡的MAC地址是（）位。
A.16
B.32
C.48
D.128
