[化] 硫酸铁铵; 铁铵矾(硫酸铁与硫酸铵形成的水合复盐)

澳洲新闻 (ABC新闻快递) 2011-11-20

In business, Optus has called for Telstra's proposals on its participation in the national broadband network to be blocked. Optus' chief executive Paul O'Sullivan says Telstra's current plan for the separation of its retail and wholesale arms wholesa

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澳洲ABC新闻快递2011年

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I believe in honor, faith and service I believe that a little outrage can take you a long. . . . I believe in freedom of speech I believe in empathy I believe in truth Renee Montagne: On Mondays, we bring you our series, This I Believe. Short statem

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2005年NPR美国国家公共电台

Protamine Sulfate Injection

Protamine sulfate is a drug that reverses the anticoagulant effects of liver compounds such as heparin. Protamine is extracted from the sperm of salmon and other species of fish, and then made into a protamine sulfate injection which is a necessary d

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AGRICULTURE REPORT - Carbon Dioxide and Crops

AGRICULTURE REPORT – March 12, 2002: Carbon Dioxide and Crops By George Grow This is the VOA Special English AGRICULTURE REPORT. Increasing levels of carbon dioxide gas in Earth’s atmosphere have

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农业与发展

【英语时差8，16】全球变暖2

We keep pumping carbon dioxide into the atmosphere and the earth keeps warming. Climate scientists have predicted that the consequences of unchecked warming could result in everything from catastrophic flooding to larger and more deadly hurricanes. S

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英语时差8，16

英语听书《海底两万里》第170期第12章一切都用电(3)

First off, I'll mention that at the bottom of the sea there exist veins of zinc, iron, silver, and gold whose mining would quite certainly be feasible. 首先，我对您说，海底有锌、铁、银、金等矿藏，开发并不是不可能的事。

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《海底两万里》中英双语有声读物

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-browed

a'cockbill

activity-dependent reinforcement mechanism