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问题 选择题
下列运算正确的是（　　）
A．（a2）3=a6B．a2+a=a5C．（x-y）2=x2-y2D．
38
+
2
=2
2
答案

A、（a2）3=a6，本选项正确；

B、本选项不能合并，错误；

C、（x-y）2=x2-2xy+y2，本选项错误；

D、

38
+
2
=2+
2
，本选项错误，

故选A

多项选择题

门静脉高压症合并食管胃底静脉破裂出血，临床有哪些特点

A．脾大，脾功能亢进

B．食管黏膜撕裂引起大出血

C．球蛋白减少，导致腹水

D．凝血酶原时间延长，出血不易止

E．严重者可致昏迷
查看答案
单项选择题

Virtualization is an approach to IT that pools and shares (71) so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human (72) are aligned around an application or business function. With a virtualized (73) , people, processes, and technology are focused on meeting service levels, (74) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (75) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

（74）是（）

A.content

B.position

C.power

D.capacity
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