题目内容

试述表面活性剂的分类并列举代表性物质的应用。

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The word "bead" originally means "prayer", but later it refers to "the prayer bead", the visible manifestation of a prayer, finally "small, ball-shaped piece of glass, metal or wood". This is an example of______.

A. meaning-shift
B. widening of meaning
C. narrowing of meaning
D. loss of meaning

In the word "multifunctional", which is the root？

A. mul
B. function
C. func
D. al

All words contain a______.

A. bound morpheme
B. root
C. suffix
D. prefix

设备上所用电炉子、电热、电焊机可不设规范接地线。()