单项选择题

Pursue not so much the material as the ideal, for ideals alone _______ life with enduring worth. A.
invest B.
speculate C.
undertake D.
include

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在PF层压制品中应用较多的是层压板，其特点是：[填空(1)] 、力学强度高、[填空(2)] 、热导率低、[填空(3)] 、易于机械加工。

答案：密度小；电性能好；摩擦系数小

单项选择题

Which of the following is NOT an element of good diction?（）

A．Using interesting words.
B．Using specific, descriptive words.
C．Repeating yourself often to make a point.
D．Eliminating confusing words