不定项选择

在金属材料中，晶界会阻碍晶体变形，使其强化。

A．正确
B．错误

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单项选择题

Why effective time management is more essential for IT professionals?
A、 IT professionals have a bigger challenge since we are in the information age.
B、 IT professionals have a bigger challenge since internet plays an important role.
C、 IT professionals have a bigger challenge since technologies and the skills required to compete in the marketplace where they change rapidly.
D、 IT professionals have a bigger challenge since our life is so different than before.

单项选择题