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41. | surface coverage |
| 表面覆盖度 |
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42. | aerial coverage |
| 航摄范围 |
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43. | repeat coverage |
| 重复覆盖 |
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44. | satellite coverage |
| 卫星覆盖范围 |
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45. | search coverage |
| 探测区域 |
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46. | immunization coverage |
| 接受注射的百分率 |
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47. | blotch coverage |
| 满地罩印;满地印花面积 |
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48. | repetition coverage |
| 重复航摄面积 |
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49. | Covert coverage |
| 隐性采访;秘密采访 |
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50. | turret coverage |
| 炮塔转动范围 |
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