维生素D缺乏性佝偻病早期临床表现是A．方颅B．鸡胸C．睡眠不安D．手镯E．O型腿

设A为n（n≥2）阶方阵，A*是A的伴随矩阵，则下列等式或命题中，正确的是（）。

A．AA*=｜A｜

B．A^-1=

C．若｜A｜≠0，则｜A*｜≠(0

D．若A的秩R(A_=1，则A*的秩R(A*)=1

Virtualization is an approach to IT that pools and shares (36) so that utilization is optimized and supplies automatically meet demanD. Traditional IT environments are often silos, where both technology and human (37) are aligned around an application or business function. With a virtualized (38) , people, processes, and technology are focused on meeting service levels, (39) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (40) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

A．profits

B．costs

C．resources

D．powers

家长应根据儿童的年龄特点选择玩具，一岁前儿童玩具主要是（）

A．练习手的抓握和带响的可活动的玩具

B．练习行走和手的操作的玩具

C．发展智力的和练习手的技能的玩具

D．成型的玩具和一些文字、数字的材料等

《商品房销售管理办法》(建设部令第88号)是( )。

A．单行条例

B．行政法规

C．地方性法规

D．部门规章

烟舌在烟枪内对烟丝束进行第一次压缩，使卷烟纸形成“U”形状。