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问题 单项选择题

母猪群，高热稽留，腹泻，呼吸困难，耳部及腹下皮肤有较大面积发绀，部分孕猪发生流产、死胎，取淋巴结染色镜检，发现香蕉形虫体。

该疾病可能是（）（724-20）

A、棘头虫病

B、旋毛虫病

C、肾虫病

D、球虫病

E、弓形虫病

答案

参考答案：E

单项选择题

某商业建筑物的有效年龄为5年，年平均折旧率为2.5%，假设建筑物的残值率为零，建筑物的经济寿命为（）年。

A.30

B.40

C.50

D.60
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单项选择题

Asynchronous Transfer Mode (ATM) is a (16) that promises to change the fabric of local and wide area communications.

The key advantage of ATM is the capability to move voice, data, graphics and (17) at speeds of up to 2 gigabits per second.

An ATM switch allows you to create a (18) network that is completely independent from the (19) configuration of the network.ATM uses a (20) called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.

（19）是（）

A. technology

B. video images

C. logical

D. physical
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