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【单选题】
In Grecian cities, emigrants in the city would take a portion of the fire, which served as a connecting link between the Greek colony and ( ) .A.
their home
B.
their families
C.
the gods
D.
their mother country
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【单选题】Normally, for each cup of green tea,( )of tea leaf is enough. And for each pot of oolong tea or pu'er tea, it's better to use() tea leaf.
A.
4g,7g
B.
3g,7g
C.
7g,3g
D.
8g,4g
【简答题】今有已放置5年的阿司匹林原料,欲测其含量,精密称取0.3256g,加中性乙醇20mL使阿司匹林溶解,加酚酞指示液2滴,滴加 NaOH 液(0.1032mol/L)至溶液显粉红色,再精密加 NaOH 液(0.1032mol/L)40.00mL,置水浴上加热15分钟,迅速放冷至室温,用 H 2 SO 4 (0.05000mol/L) 滴定,消耗 H 2 SO 4 液23.45mL,求本阿司匹林含量( ...
【简答题】第三类防雷建筑物专设引下线不应少于_______根,并应沿建筑物四周和内庭院四周_______布置,其间距沿周长计算不宜大于_______m。
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