硬化性横纹肌肉瘤的特征为弥漫性表达（） A.myogenin B.desmin C.

-Your sister nearly ________ all her spare time to her study during the three years.

-That's right，or she ________ first place in her school in the College Entrance Examination.[ ]

A．devoted; wouldn't have taken

B．spent; wouldn't have taken

C．hadn't devoted; hadn't taken

D．hadn't spent; couldn't take

儿童能够进行逻辑推理，且获得了长度、体积、重量和面积的守恒，这处于认知发展的（）。

A.感知运动阶段

B.前运算阶段

C.具体运算阶段

D.形式运算阶段

小儿易患急性脓耳，与小儿咽鼓管的如下特征有关（）

A.咽鼓管较短

B.咽鼓管较长

C.内径较宽

D.内径较细

E.咽鼓管平直

右支气管较左支气管（）

A.细

B.长

C.倾斜

D.不易落入异物

E.以上均不对

Stokes效应与反Stokes的效应是什么？