Introduces the structure, characteristics and mechanical machining methods for T-type Sodium globe valve body.

介绍了T形钠截止阀阀体的结构、特点及机械加工方法。

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T he obtained data show that:the complex of humic acid and sodium-lignosul phonate can elevate the discharge capacity and rechargeable acceptance ability of lead-acid battery;

试验数据表明：当采用木素磺酸钠为膨胀剂时，最好与腐殖酸复合，这样可提高电池的放电容量和充电接受能力；

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That is metallic sodium that would keep in kerosene so it doesn't react with the oxygen in the air.

金属钠应该保存在没有中,这样它就不会和空气中的氧气反应了。

麻省理工公开课 - 固态化学导论课程节选

Now, sodium and potassium don't ordinarily move across membranes, they're charged molecules, they can't dissolve, they can't permeate through a cell membrane, but they go through because there are channels that allow them to pass through in the membrane.

钠和钾通常是不能跨过细胞膜的,它们都是带电粒子,它们不能溶解在细胞膜中,不能渗透通过细胞膜,但它们之所以能通过细胞膜,全赖膜上离子通道的作用

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