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| 31. | underlying strata |
| 底板岩石 |
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| 32. | printed chassis |
| 印刷电路底板 |
|
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| 33. | printed circuit backplane |
| 印制电路底板 |
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| 34. | plexiglass base plate |
| 有机玻璃底板 |
|
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| | |
| 35. | hogbacked floor |
| 波浪形底板 |
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| 36. | seat cushion board |
| 座垫底板 |
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| 37. | boiler bottom plate |
| 锅炉底板 |
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| 38. | subbase footing |
| 基础底板 |
|
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| | |
| 39. | brake backing plate |
| 制动器底板 |
|
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| 40. | pilot tunnel floor |
| 导坑底板 |
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