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【单选题】
（）的作用是警告工作人员不得接近设备的带电部分，提醒工作人员在工作地点采取安全措施，以及禁止设备合闸送电等。A.
绝缘台
B.
绝缘垫
C.
标示牌
D.
遮栏
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皮皮学刷刷变学霸
举一反三
【简答题】A plant cell with the vacuole pushing out on the cell wall is said to be___________ and the vacuole is exerting turgor pressure on the inelastic cell wall.
【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
【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 ( )
【单选题】The structure of cellulose in the plant cell wall is simple: linear polymers of thousands of (β1→4)-linked D-glucose units, assembled into bundles of at least ___ chains, which co-crystallize to form ...
A.
14
B.
16
C.
18
D.
20
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