都纲

证明了局部紧且具有可数基的度量空间上的弱下半连续函数和自反的巴拿赫空间上的弱下半连续函数的间断点集合都是第一纲集。

In this paper we prove that a set of discontinuous points of a lower semi-Continuous function on a local Compact and countable metric space or a weak lower semi-continuous function on a reflexive Banach Space is a first Category .

虽然疾病的临床表现很复杂，但都可以根据八纲归类。

Complicated as the clinical manifestations of diseases may be , they are classified under the eight principles .

虽然现在所发现的海绵中约有90%都属于寻常海绵纲，但此类海绵化石比其他类型的更加罕见，因为它们的骨骼由相对柔软的海绵硬蛋白组成，不易形成化石。3.水母

Although about 90 % of modern sponges are demosponges , fossilized remains of this type are less common than other types because their skeletons are composed of relatively soft spongin that does not fossilize well . 3.Jellyfish