题目内容

SOLAS公约要求，固定水灭火系统必须安装隔离阀。放隔离阀处于关闭状态时，消防水是由何种设备供应？

A. 船舶通用泵
B. 船舶主消防泵
C. 应急消防泵

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derivation

青霉素钠的鉴别

A. 麦芽酚(MALTOL)反应
B. 羟肟酸铁反应
C. 抑菌试验
D. 色谱法
E. 滴定法

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"？)