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问题 选择题

下列对“摩尔（mol）”的叙述不正确的（　　）

A．摩尔是一个物理量

B．摩尔是一个单位，用于计量物质所含微观粒子的多少

C．摩尔既能用来计量纯净物，又能用来计量混合物

D．1mol任何气体所含的气体分子数目都相等

答案

答案：A

单项选择题

关于卵巢良性畸胎瘤的影像，下列哪项不对()

A．囊性病变，囊壁厚薄不均，有钙化

B．TWI、皮样囊肿为高信号

C．可见骨、牙齿

D．CT可见到脂液面

E．以上都不是
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.

(21) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.

(22) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

(23) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

(24) is the popular LAN developed under the direction of the IEEE802.5.

(25) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

（21）是（）

A. The MAC address

B. The IP address

C. The subnet address

D. The virtual address
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