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| 31. | t beam with double reinforcement |
| 复筋丁字梁 |
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| 32. | cerium ,double sulphates of |
| 铈的复硫酸盐 |
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| 33. | complex double projective plane |
| 复双射影平面 |
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| 34. | double-chamber sand blast apparatus |
| 复室喷砂装置 |
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| 35. | double metallic standard system |
| 复金属本位制 |
|
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| 36. | double-storage reperforator |
| 双存储复孔机 |
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| 37. | double acting pile hammer |
| 复动桩锤 |
|
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| 38. | double spring bottom oil ca |
| 复簧底油壶 |
|
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| 39. | double standards |
| 双重标准，不同标准，复本位制 |
|
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| 40. | simplex double acting pump |
| 单缸式复动泵 |
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