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【多选题】
我国新型农业经营主体包括( )。A.
家庭农场
B.
农民专业合作社
C.
农机大户
D.
农业龙头企业
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皮皮学刷刷变学霸
举一反三
【判断题】Since larger repeat units, bulkier side groups, chain branches, and polar side groups each tend to inhibit molecular motion, they also tend to increase the glass transition temperature.
A.
正确
B.
错误
【单选题】The glass transition temperature of wool: / 羊毛的玻璃化转变温度:
A.
Increases as the moisture content of wool increases 随着羊毛含湿量的增加而升高
B.
Increases as the moisture content of wool reduces 随着羊毛含湿量的增加而降低
C.
Increases as the moisture content of wool first increases then reduces 随着羊毛含湿量的增加先升高后降低
D.
Is unaffected by the moisture content 不受含湿量的影响
【单选题】Which of the following statements are correct descriptions of a glass transition in polymers?/ 以下哪一项是对聚合物的玻璃化转变的正确描述?
A.
A change in the frictional properties of the material 材料的摩擦性能发生了变化
B.
A change from stiff glass-like material to softer rubbery 从硬的玻璃态变为软的橡胶
C.
Is associated with the crystals in the fibre 只发生在天然纤维中
D.
Normally occurs at a higher temperature than melting 与纤维中的结晶区有关
【判断题】22判断Increasing the molecular weight tends to raise the glass transition temperature
A.
正确
B.
错误
【简答题】Translate the following into Chinese At high temperatures (above the glass transition temperature) glass no longer behaves in a brittle manner: it behaves as a viscous liquid.
【多选题】The value of glass transition temperature will depend heavily on _________.
A.
Chain flexibility
B.
Steric hindrance and polarity
C.
Copolymerization
D.
Mw and cross-linking
相关题目：
【判断题】22判断Increasing the molecular weight tends to raise the glass transition temperature
A.
正确
B.
错误