当光照向卡背面时，能看见一头加州棕熊的微型穿孔轮廓。
And a tiny perforated outline of a Californian brown bear is visible when a light is shone from behind.
给出了实际使用的各种微型计算机与穿孔机的联机接口方法和电路。
Methods and circuits in practical use for interfacing various micro - computers and punchers are illustrated.
给出了实际使用的各种微型计算机与穿孔机的联机接口方法和电路。
Methods and circuits in practical use for interfacing various micro - computers and punchers are illustrated.
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