He was demonstrating hydrogen gas production at milliamp and kilovolt levels.
他示范并千伏各级氢气产量为毫安。
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One of them combines lithium manganese oxide with other ions, and operates at about three to five volts with a charge capacity of 200 milliamp hours per gram.
While Milliamp does offer tools and instructions for do-it-yourself battery replacement for an iPod, the company says that replacing the battery in an iPhone is simply too difficult to try at home.