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简述担子菌菌丝体发育的五个阶段。

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以T4噬菌体为代表，简述病毒增殖的五个阶段。

试简述张节理与剪节理的区别。

If, however, an animal finds itself in abnormal conditions, it may show ____(不正常的) aggressiveness.

At the international level an ____(积聚) of hostile emotions finally finds expression in large-scale impersonal warfare.