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【判断题】
一个调速系统的调速范围,是指在最高速能满足所需 静差率 的转速可调范围A.
正确
B.
错误
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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（ ）。
【单选题】About ___ cellulose molecules are held together via hydrogen bonds in a single cellulose microfibril. Cellulose microfibrils give the plant cell wall its tensile strength.
A.
10
B.
12
C.
14
D.
16
【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.
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