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单项选择题

环氧树脂胶黏剂的下列特性，何者是不正确的？( )

A.耐热、电绝缘
B.耐化学腐蚀
C.能黏结金属和非金属
D.能黏结塑料
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单项选择题
Choose the most appropriate answer by completing the sentences below or answering the questions.
1. Which of the following statement is NOT true?
A．Alex prefers to stay indoors, because he feels discomfort.
B．Alex prefers to stay indoors, because he wants to read novels.
C．His eyes hurt, because it is heavily polluted in Beijing.
D．Alex has a sore throat.
单项选择题
当室内坡道水平投影长度超过多少时，应设休息平台？( )
A.10m
B.12m
C.15m
D.18m
单项选择题
图示结构各杆截面均为矩形，截面高度，材料的线膨胀系数为，则结构在图示温度变化作用下B点的水平位移为（向右为正）

A、
B、
C、
D、
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