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半径为R的圆周上运动的质点,其速率与时间的关系为v=ct2(c为常数),则t时刻的切向加速度大小为

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If [twe] were a new word in English to which the suffix [-s] can be added, which statements listed below would apply to this word?

A. It can only be a verb.
B. It can only be noun.
C. It may be a noun or a verb.
D. Its word class is not identifiable.

________modify the meaning of the root, but usually do not change the part of speech of the original word.

A. a. Prefixes
B. b. Suffixes
C. c. Stem
D. d. Affixes.

The word formation process in the word “smog” is called _____.

A. a. Clipping
B. b. Backformation
C. c. Blending
D. d. Conversion

If [blick] were a new word in English to which the suffix [-er] can be added, which statements listed below would apply to this word:

A. a.It can only be a verb.
B. b.It can only be a noun.
C. c. It can only be an adjective.
D. d. Its word class is not identifiable.

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