水平角观测使用的经纬仪，应满足的技术要求包括( )。
A．照准部旋转各位置气泡读数差，不超过1格
B．光学测微器行差及隙动差，DJ1不超过1"，DJ2不超过2"
C．横轴不垂直于竖轴之差，DJ1不超过10"，DJ2不超过15"，DJ6不超过20"
D．视准轴不垂直于横轴之差，DJ1不超过6"，DJ2不超过7"，DJ6不超过10\
E．垂直微动螺旋使用时，视准轴在水平方向上不产生偏移
参考答案：A,B,C,D
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| Dear friends , My name is Frank. I am from America. Here is a picture of our class. We are in Class 3, Grade 7. The name of our school is St John's High School. We are learning Chinese in our school. Our Chinese teacher's name is Joy Wang. Can you see her in the picture? You can see my friends in the picture , too. Jimmy is tall and has black hair. He is good at playing basketball. He is on the school team. Mary is short and is wearing a yellow dress. She is good at math. Sandra has long hair. She can speak French. Sally is a black girl. She has short hair. She likes swimming. She is on the swimming team. I like music. Can you find me? I'm the boy with glasses. Maria is new here. She is from Hong Kong. She has black hair and black eyes. She speaks English well, and she is very good at computer. Nick is big. He has small eyes. He is fun. He can play football. Send(寄) me a picture of your class and tell me about your friends ! Yours , Frank | ||||||||||||||||||||||||||||||||
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