问答题
公猪采精时需注意哪些事项?
【参考答案】
公猪副性腺发达,射精量大,完成射精往往需要经历3个阶段,而在各个射精阶段的间隔时间要恢复刺激,直至采完全部精液为止。 自......
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Sometimes two couples go out together. This is known as “ ______ dating”. Group dating is also ________ among young people. Large groups of boys and girls may _________ together. Young people may go out together for a long time, which is, ________, a public statement of their ________ to marry. Men and women go out together ___________ especially those in cities.
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铸造铝合金主要有哪几种?说明其代号的表示方法?
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