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【多选题】
大多数工程材料可假设为漫灰体，该假设带来的好处是：A.
同温度下发射率与吸收比相等。
B.
发射率仅取决于表面自身特性，不再受外界条件影响。
C.
吸收比仅取决于表面自身特性，不再受外界条件影响。
D.
，计算更方便。
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反馈参考答案：
举一反三
【简答题】开始关注提高学生的成绩，说明教师进入 _______阶段。
【多选题】Read the following statements. Then listen to a report and identify which of them are correct.
A.
If you think about your anger situation while using the destruction therapy, the therapy will be much more satisfying.
B.
If you don't deal with your anger, sooner or later it will explode.
C.
Laughter therapy can help people feel less pain.
D.
In Spain, some companies send their workers to build hotels when they feel that their workers are stressed, or they need to build a team.
E.
On average, children laugh up to 100 times a day, but adults only laugh about 17 times a day.
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