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问题 填空题

“痛痛病"是因饮用被______________污染的水源而引起的一种慢性中毒，首先发现于日本，其特点______________：______________、和______________。

答案

参考答案：镉；肾小管再吸收障碍；骨软化症；消化道吸收不良

单项选择题 A1/A2型题

移植排斥反应的防治原则是（）.

A.血型相配

B.免疫耐受诱导

C.使用免疫抑制药物

D.选择MHC配型相配的供者

E.以上均正确
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单项选择题

astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost (141) . For example, the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (142) . Hence, additional maintenance procedures must be maintained and administrative records are (143) . The duplication of transport facilities to carry (144) network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space and an increase in power connections and power consumption, migration of these (145) network elements to IP-based DCns is alogical strategy.

（144）是（）

A.overlook

B.overlie

C.overlay

D.overleap
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