KM 4是我国自行设计、制造的一座空间模拟设备，用于在地面上对各种人造卫星进行热真空测试。
KM4 is a large facility for space environmental simulation for the heat-vacuum test of man-made satellites.
抽样的产品必须通过不同条件的测试，例如骤冷骤热的温度差测试，真空测试，强压测试等。
Selective products have to pass the test in different conditions, such asshock heating and cooling, vacuum and pressure.
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