Ann and Jenny are good friends. They are in the   56  （相同）class, they often go to school and go home together . However , they have different   57 （习惯）. Ann likes to stay at home and watch TV when she is   58 （空余的）, but Jenny likes sports. He   59 （锻炼）every day He thinks it can help him keep   60 （健康的）. And he likes to spend time in the countryside on weekends. He thinks the countryside is more beautiful   61 （比）the city .The winter vacation is coming. Jenny asked Ann to go out with her friends. They are   62 （计划）to go hiking in the mountain. They are going fishing by the   63 （河）. They   64 （相信）they can have an exciting vacation. They also hope   65（每人）will have a good time.

微倾水准仪的基本构造是由哪3部分组成？自动安平光学水准仪在构造上有哪2个特点？