Such words are( pain) ______ to me.

标准差或变异系数表示

回收实验可表明

回归系数表示

相关系数表示

有效数字表示

租赁期长短

项目的寿命期

设备的经济寿命

设备的技术性能和生产效率

设备在使用过程中的财产保险费

加Ba(Ac)₂

加Hg(Ac)₂处理

直接滴定

加HgCl₂处理

电位法指示终点

加Ba(Ac)₂

加Hg(Ac)₂处理

直接滴定

加HgCl₂处理

电位法指示终点

3 750～3 000cm^-1

1 900～1 650cm^-1

1 900～1 650cm^-1；1 300～1 000cm^-1

3 750～3 000cm^-1；1 300～1 000cm^-1

3 300～3 000cm^-1；1 675～1 500cm^-1； 1 000～650cm^-1

Our community has just modified the requirements for high school students to become graduates. It requires all students to finish at least forty hours of (36) learning (37) they get a diploma that they have (38) for. Service learning is such a learning that also benefits the community. It includes such activities as picking up rubbish along the banks of river, working in a soup kitchen, or tutoring A student. After a service (39) , students must write a (40) about what they have learned.

It is asserted by supporters that there are a lot of (41) of service learning. First and foremost, students are forced to think not only their own (42) but others’, and gradually become very (43) of the needs of others. (44) , students can learn some skills that are closely related to their real life such as (45) , problem solving, and team spirit. Finally, students may find out possible careers (46) service learning.

If, for instance, a student wonders what teaching is like, he or she can choose to tutor a student in a reserved classroom several hours each month. (47) there are many benefits, opponents (反对者) raised some questions (48) the new requirements. First, they argue that students go to school (49) to learn core subjects and skills. Service learning, however, is time-consuming and students who spend too much time on it will certainly (50) the core subjects. Second, they hold the opinion that forcing students to work with no (51) is illegal. By requiring service, the school deprives an individual of freedom to choose.

As far as I’m concerned, service learning is beneficial not only to the community, but to (52) because they can learn new skills, and find out different careers suitable for them. However, I don’t advise that people (53) others under force and the (54) to help others must come from the bottom of the heart. I think the best solution is to give students choices: A student should choose at least forty hours of either independent study or service. It advocates both freedom and responsibility, and as young adults, we must learn to deal with both (55) .