【简答题】请你根据下列学生实验方案,回答问题. 为证明细菌对植物遗体的分解作用,某小组同学设计了一个实验方案:将同一种树的树叶分成甲、乙两组,实验中滴加蒸馏水,让树叶保持潮湿;将甲、乙两组都进行灭菌处理后,甲组放在无菌环境下,乙组接种细菌后放在无菌环境下.请你分析后作答: (1)这个方案的实验组是______,对照组是______.变量是______. (2)实验过程中滴加蒸馏水让树叶保持湿润是因为细菌生存...
【判断题】检索专利文献可以从专利名称、发明人或专利分类号等字段查找。
【单选题】下列哪一项是正确的 float 变量的声明
【单选题】下列哪一项是正确的float变量的声明?
【单选题】The teacher with two of his students is walking into the classroom. ( )
B.
The teacher with two of his students
【单选题】One of his ______ is to become the President of General Motor.