【简答题】The ant(蚂蚁) works every day but the monkey plays in the tree every day in summer. One day the ant is carrying some candy to her home. Her home is next to a big tree. The monkey is playing s in the...
【单选题】We play basketball after school . [ ]
【判断题】无菌操作指的是防止微生物(杂菌)进入无菌范围的操作技术。
【单选题】We play sports____________. [ ]
【简答题】阅读理解。 Every day, life is made and lost. Every day, life goes on. Every day we experience some of the most important parts of life and may not even realize it: love, generosity, and perseverance. These...
【简答题】阅读理解。 Every day life is made and lost. Every day, life goes on. Every day we experience some of the most important parts of life and may not even realize it: love, generosity, and perseverance. These ...
【单选题】若一棵二叉树有12个度为0的结点,6个度为1的结点,则有_______个度为2的结点。
【单选题】若在一棵度为3的树中,有3个度为3的结点,2个度为2的结点,2个度为1的结点,该树中叶子结点的个数为()
【判断题】无菌操作指的是防止微生物(杂菌)进入无菌范围的操作技术。
【单选题】微生物培养过程中,要十分重视无菌操作。现代生物学实验中的许多方面也要进行无菌操作,防止杂菌污染。请分析下列操 作中错误的是 ( ) 1 煮沸消毒可以杀死微生物的细胞和部分芽孢 2 接种操作要在酒精灯火焰附近进行 3 无菌繁殖脱毒苗时,植物的外植体要进行消毒 4 家庭制作葡萄酒时要将容器和葡萄进行灭菌 5 培养基要进行高压蒸汽灭菌 6 加入培养基中的指示剂和染料不需要灭菌