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【单选题】
因噪声而使收听清晰度下降问题，同下列哪一种现象有关。（）A.
干涉
B.
屏蔽
C.
反射
D.
衍射
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反馈参考答案：
举一反三
【单选题】( ) is the most abundant organic molecule providing the fibrous component of the plant cell wall.
A.
cellulose
B.
protein
C.
pectin
D.
hemicellulose
【简答题】在限制行为能力人在学校受到意外伤害的事故处理中，学校责任适用的归责原则是（ ）。
【简答题】Describe the structure of the plant cell wall?/植物细胞壁由哪几层构成?各有何特点?
【简答题】下列不能作为存储器容量单位的是 ( )
【多选题】How do cellulose microfibrils give the plant cell wall its tensile strength?
A.
Like all extracellular matrices, plant cell walls derive their tensile strength from long fibers oriented along the lines of stress.
B.
In higher plants, the long fibers are generally made from the polysaccharide cellulose, the most abundant organic macromolecule on Earth.
C.
These cellulose microfibrils are interwoven with other polysaccharides and some structural proteins, all bonded together to form a complex structure that resists both compression and tension.
D.
Other polysaccharides cross-link the cellulose microfibrils, while the polysaccharide pectin fills the spaces between the microfibrils, providing resistance to compression. The middle lamella is rich in pectin and is the layer that cements one cell wall to another.
【多选题】有关脑底异常血管网病，下列正确的是（ ）
A.
又称烟雾病或Moyamoya病
B.
因在脑血管造影中显示出颅底异常增生的血管网看似飘散在空气中的一股袅袅上升的烟雾而得名
C.
本病的临床特点是颈内动脉虹吸段和大脑前、中动脉近端狭窄或闭塞
D.
脑底大量异常小血管网
E.
以缺血为发病表现
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