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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