题目内容
derivation
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青霉素钠的鉴别
Determine whether the words in each of the following groups are related to one another by
In English, the suffix -er can be added to a place name. Examine the words in the two columns below. Column A Column B Londoner Glasgower New Yorker Denverer Berliner Sydneyer Dubkiner Australiaer Newfoundlander Victoriaer Winnipeger Calcuttaer New Zealander Bristoler In general terms, what does the suffix -er mean in these words？ How is this -er different in meaning from the -er found in the words skater and walker？ (3)State the constraint on the distribution of -er illustrated above in your own words. Does this constraint also apply to the type of -er used in the word skater？(Hint: What would you call "one who discovers" or "one who ploughs"？)
油船甲板固定灭火系统多采用_____灭火剂。
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