盐酸—镁粉反应
参考答案:
鉴定黄酮类化合物,将试样溶于甲醇或乙醇中,加入少许镁粉振摇,再加几滴浓盐酸呈色。
Frank is my good friend. We are in the same class. He is fourteen, one year older than me. His parents are both teachers in No 7 Middle School. Frank studies hard. His English and math are very good. He often helps other students with their English and math. Our teachers like him very much.
We go to school together by bike in the morning. We have lunch at school. After school in the afternoon, we often play sports. We play soccer and baseball. In the evening, he does his homework at home. Sometimes he watches soccer games on TV. On Sundays, he goes out with his parents in his father’s car. They play in the park and do sports there. Sometimes my father takes me there, too. We play sports together. We have a good time.
小题1:Who is Frank? He is a _________.
A.teacher
B.soccer player
C.student
D.driver小题2:I’m ________ years old this year.
A.fourteen
B.thirteen
C.fifteen
D.sixteen小题3:Frank is good at __________.
A.math and Chinese
B.English and Chinese
C.math and English
D.music and Chinese小题4:Frank __________ at school.
A.has breakfast
B.has supper
C.has lunch
D.watches TV小题5:When does Frank do his homework?
A.In the evening
B.In the morning
C.In the afternoon
D.At noon.
根据《关于实行建设项目法人责任制的暂行规定》,项目董事会的职权之一是( )。
A.组织工程招标工作 B.负债生产准备工作和培训有关人员C.组织编制项目初步设计文件 D.提出项目开工报告