单项选择题

A brittle material has very little plastic deformation.

A.正确
B.错误
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单项选择题
High temperature may change a ductile material into brittle.
A.正确
B.错误
单项选择题
8 By ( ) traversing the binary sort tree, we can get the non decreasing sequence of key values of each node.
A．inorder
B．level
C．postorder
D．preorder
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