【简答题】The difference between a liquid and a gas is obvious【66】the conditions of temperature and pressure commonly found at the suce of the Earth. A liquid can be kept in an open container and f【67】it to ...
【单选题】图为生态系统各个成分间的相互关系.据图分析下列说法正确的是( )
C.
图1有1条食物链,其中A为生产者,它能够将无机物转化成有机物
D.
若A、B、C包括地球上所有的生物,则A、B、C的总和为生物圈
【单选题】图示为某农田生态系统的食物网,据图分析下列说法正确的是( )
C.
青蛙是稻田的“卫士”,在该生态系统中位于第三营养级
D.
农田生态系统是典型的人工生态系统,其稳定性最强
【单选题】The difference between a liquid and a gas is obvious under the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fill it ...
A.
The Properities of Gases and Liquids.
B.
What Fluids and Gases Are Made of.
C.
New Uses for the Gas and the Liquid.
D.
New Theories about Fluids and Gases.
【单选题】动态分配包含20个元素的int型数组,下列语句中正确的是( )。
【单选题】下图为小鼠体内细胞的形态、数目变化情况,据图分析下列说法正确的是 [ ]
B.
①②过程不仅发生染色体变异还可能发生基因重组
C.
②过程中细胞的遗传物质改变,导致细胞发生脱分化
D.
V细胞与已免疫的小鼠效应B细胞融合能用于制备单克隆抗体