学校召开大会时,使用扩音设备的主要目的是[ ]
A.提高音调
B.改变音色
C.增大响度
D.提高声速
答案:C
96. Sometimes an empty box is fun to a child. That’s because the box can become ______ a child imagines _____ to be.
A.anything; one
B.something; one
C.everything; it
D.anything; it
多发性骨髓瘤的X线表现中,下列哪项不正确
A.约10%的病人,X线表现正常
B.多发、“穿凿样”骨质破坏以颅骨最常见最典型
C.常合并广泛骨质疏松
D.常合并骨质硬化
E.四肢短管状骨少见