题目内容

下列等式成立的有( )。

A. 单位边际贡献=销售单价 x边际贡献率
B. 边际贡献率=(单位边际贡献÷单价) x 100%
C. 边际贡献率=1-变动成本率
D. 边际贡献率=1-安全边际率

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求下列函数的导数（连线各题的答案）

Read Text B in Unit 5and spot the answers for the following questions.1)Please tick out the advantages of regular exercise.

A. Improving circulation
B. Making the blood pressure lowered
C. Moving the cells of the immune system efficiently
D. Boosting the immune system
E. Killing white blood cells
F. Decreasing T lymphocytes
G. Boostinga healthy heart
H. Moving the substances of the immune system freely
I. Controlling body weight

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Read Text B in Unit 5and spot the answers for the following questions.Whether extensive exercise can damage the athletes’ immune system depends on the changes in the following components.

A. Blood
B. Cytokines
C. Urine
D. Antibodies
E. White blood cells
F. Thymus

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Read Text C in Unit 5 .In the text, the author has cited two researches about the stress’s effect on the immune system. The following are the major findings of the two studies. Please write the correct answer from the box to each of them.

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下列等式成立的有( )。

A. 单位边际贡献=销售单价 x边际贡献率 B. 边际贡献率=(单位边际贡献÷单价) x 100% C. 边际贡献率=1-变动成本率 D. 边际贡献率=1-安全边际率

求下列函数的导数（连线各题的答案）

Read Text B in Unit 5and spot the answers for the following questions.1)Please tick out the advantages of regular exercise.

Read Text B in Unit 5and spot the answers for the following questions.Whether extensive exercise can damage the athletes’ immune system depends on the changes in the following components.

Read Text C in Unit 5 .In the text, the author has cited two researches about the stress’s effect on the immune system. The following are the major findings of the two studies. Please write the correct answer from the box to each of them.

A. 单位边际贡献=销售单价 x边际贡献率
B. 边际贡献率=(单位边际贡献÷单价) x 100%
C. 边际贡献率=1-变动成本率
D. 边际贡献率=1-安全边际率