在一张未标明日期的图片中，一架实物模型的A - 12间谍飞机倒挂着停放在51区的一个测试塔上，这是为了测试该飞机的外观在雷达上可视或不可视的程度。
In an undated picture, a mock-up of the A-12 spy plane sits perched upside down on a testing pylon at Area 51-part of radar tests to reveal revealed how visible, or invisible, the design was to radar.
马克的测试方法是用在货币材料实物模型与最佳外的样品的性能比较与糖尿病测试等机型。
Method of DM test is to use the model with best out-of-sample performance within a kind of currency material to compare with other models for DM test.
马克的测试方法是用在货币材料实物模型与最佳外的样品的性能比较与糖尿病测试等机型。
Method of DM test is to use the model with best out-of-sample performance within a kind of currency material to compare with other models for DM test.
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