单选：菊花通常在秋天开放，若打算使菊花提前开放，应采取的措施是（）。A．增加灌溉B．喷施生长素C．提高温度D．通过复盖，缩短日照

题目分类：生物学
题目类型：单选
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题目内容：

菊花通常在秋天开放，若打算使菊花提前开放，应采取的措施是（）。
A．增加灌溉
B．喷施生长素
C．提高温度
D．通过复盖，缩短日照

参考答案：【答案仅供学习，请勿对照自行用药等】

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血液中氧化碳的含量测定必须：（）A．采耳血B．采肘正中静脉血C．采毛细血管血D．采心脏内大血管血

分类：生物学题型：单选

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分类：生物学题型：单选