Methods Semi-quantitative PCR method was used in this research to estimate PERV copy-number of four mini-pigs in China.

方法采用半定量pcr方法检测了我国四种小型猪内源性逆转录病毒基因的拷贝数。

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Notice that the copy dialog in Figure 24-5 also has a cancel button. Ostensibly, this satisfies requirement number four, that there be a way to cancel the operation.

注意图24 - 5中的复制对话框还有一个取消按钮，表面上这可以满足第4个要求，即一定要有取消操作。

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