A:在苏丹Ⅲ染液处理花生子叶后,用放大镜观察子叶细胞中的脂肪微粒
B:用光学显微镜观察染色较深的玻片标本时,应选用平面镜和小光圈
C:在探究酵母菌呼吸方式实验中,可选用NaOH溶液去除空气中的CO2
D:鉴定组织样液是否含有蛋白质,应先后加入等量的双缩脲试剂A液和B液
某同学利用图示装置来研究凸透镜成像.
A
Yu Dabao was born in 1988 in Qingdao. He loved playing soccer when he was a kid. When he was young, his father took him for training. People called Yu "China's lucky star" because he saved his team many times in important games.
Zhang Dasheng is from Shanxi. When he was 5 years old, he fell in love in driving. Now, he is 24 years old and he becomes the first Chinese to be chosen in Porsche's young driver development program.
Emma Watson was born in 1991. She is a British actress. She played the beautiful princess in Disney's new movie. She also sang for the movie. It was the first time for her to do so in her career. The movie has been shown in China.
On January 27, Emma Stone won the Best Actress Oscar. She is only 28 years now! Stone loved acting as a child. At the age of 14, she left high school. Then she moved to Los Angeles with her family in order to build an acting career.