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在JavaScript中，可以为函数指定一个返回值，返回值可以是任何类型，使用语句可以返回函数值并退出函数。

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我们把定义函数时指定的参数成为，把调用函数时实际传递的值称为。

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[音频]Hi, I'm Elizabeth Hoffler, Master of Social Work. I'm a social worker, a lobbyist and a special assistant to the Executive Director at the National Association of Social Workers. Today we are going to be talking about becoming a social worker. Social work is the helping profession. Its primary mission is to (1) human well-being and help meet the basic needs of all people, with a particular focus on those who are (2), oppressed, and living in poverty. We often deal with (3) human needs. Social work is different from other professions, because we focus on the person and environment. We deal with the external factors that impact a person's situation and outlook. And we create opportunity for (4) and (5) to help clients and communities cope effectively with their reality and change that reality when necessary.In thousands of ways social workers help other people -- people from every age, every background, across the country. Wherever needed, social workers come to help. The most well-known aspect of the profession is that of a social safety net. We help guide people to (6) resources and counsel them on life-changing (7). There are more than six hundred thousand professional social workers in the country, and we all either have a bachelor's degree, a master's degree, or a PhD in social work. There are more clinically-trained social workers than clinically-trained psychiatrists, psychologists and psychiatric nurses (8).Throughout this series, you will learn more about the profession, the necessary steps to get a social work degree, the rich history of social work and many ways that social workers help others. Later in this series, you'll hear from Stacy Collins and Mel Wilson, fellow social workers at the National Association of Social Workers. Stacy is going to walk you through the step-by-step process of becoming a social worker, and Mel will tell you about the range of (9) you have once you get your social work degree, as well as the high standards of responsibility that social workers must adhere to.The National Association of Social Workers represents nearly 145,000 social workers across the country. Our mission is to (10), protect and advance the social work profession. We hope you enjoy this series about how you can make a difference by becoming a social worker. Next, we are going to talk about choosing social work.

光电倍增管短波限的决定因素是（）

A. 光电阴极材料
B. 窗口材料
C. 光电阳极材料
D. 倍增级材料