有性杂交方式包括（）。_作物遗传育种_全学科试题题库

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有性杂交方式包括（）。
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执行窗口＞画笔命令，即可弹出“画笔”面板；放大画笔的快捷键是 [，缩小画笔的快捷键是 ] 。

评价一台交换机的性能如何，除了话务量还有（）。

常用的止血方法有：（）三种。

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Choose the best words into the sentences. Sudan is the only male northern white rhino (犀牛) left in the world. That (mean) Sudan, 42, is the last hope for avoiding extinction. (protect) him, officials have placed him under 24-hour armed guard at the OI Pejeta Conservancy in central Kenya. Sudan lives there two female northern white rhinos, Fatu and Najin. Northern white rhinos, can weigh up to 5,000 pounds, were once plentiful across northern and central Africa. (hunter) have killed thousands of rhinos because of high demand for the animals，horns (角). Rhino horns, believed to have medical effects, are used in (tradition) Asian medicines. More than 1,000 rhinos (kill) in 2014 in South Africa alone and fifty-four rhinos in Kenya, which has a much (small) population. Sudan, Fatu, and Najin have had their horns (remove) so that they will not be hunted. People hope Sudan and one of the females will be able to have a baby. Sudan is very old, but scientists will not give up hope.

对话框同窗口一样，其大小可以改变。()

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质量与等级的区别是什么（）。