R20/22 Harmful by inhalation and if swallowed.

吸入、与皮肤接触和吞食是有害的；

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A new colour plastic trademark design for tin-base of the R20 type moisture "resistant battery used instead of traditional paper trademark was discussed."

本文对传统全防潮R20型电池商标改彩塑商标后的铁底进行设计。它克服了铁底松动、接触不良等问题。

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The reckoning diagram of coke yield for domestic coal resource is obtained on basis of first-hand date of thermal test and analysis fo r20 coke ovens by almost ten years' work.

在国内20座焦炉热工测试原始数据的基础上，经整理、归纳、分析，并采用二种方法，即线性回归法和程序回归分析法，首次获得了适合我国煤源的成焦率测算图。

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