E-Learning Day2
Ļ下哪个丝是真空秝类？
ȇ然真空
ǔ离真空
ĺ为真空
ǻ对真空
Ļ下哪个丝是真空度的国际坕佝？
Pa
Mbar
Torr
Ņ都是正确
ȶ杞真空：≤10-5 Pa; 低真空：？
105~102 Pa
102~10-1 Pa
10-1~10-5 Pa
10-5 Pa
Ļ下哪个是低真空的气浝特点？
ȿ渡区域
ư体分孝之间有大針碰撞
ư体分孝之间较少碰撞
ư体分孝之间几乎丝碰撞
Ļ下哪个是真空的陝制？
ə低气体干扰
ə低气体分孝碰撞
Ō覆空间丝漝气
ƴ净
Michelle今天的衣朝是什么颜色？
ǝ色
Ƶ蓝色
Dz红色
Ǚ色
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