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问题 单项选择题 A1/A2型题

药物向中枢神经系统转运取决于药物的（）

A.分子量

B.脂溶性

C.pH

D.水溶性

E.解离度

答案

参考答案：E

解析：药物向中枢神经系统转运，取决于药物在pH7.4时的分配系数大小，而分配系数又取决于解离度。所以答案为E。

不定项选择

导致系统性金融风险的原因主要有：

A．社会信用环境不佳

B．宏观经济政策失误

C．经济周期波动剧烈

D．法制不健全

E．个别金融机构的信用不佳
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单项选择题

Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal ______ . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load ______ can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the ______ across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ______.

A. jitter B. entity C. respond time D. cost
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