【单选题】
某研究部门准备在全市200万个家庭中抽取2000个家庭，据此推断该市所有职工家庭的年人均收入。这项研究的参数是
①
2000个家庭
②
200万个家庭
③
2000个家庭的年人均收入
④
200万个家庭的年人均收入
【多选题】
家庭环境的功能主要体现在（ ）。
①
家庭在教导儿童基本生活技能方面具有重要的作用
②
家庭在教导社会规范、形成道德情操方面起着重要的作用
③
家庭在指导和形成个人理想、志趣方面有重要作用
④
家庭能够有效地培养儿童的社会角色
【单选题】
尺寸界限用（）绘制。
①
Normal
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false
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false
EN-US
ZH-CN
X-NONE
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粗实线
②
细
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实线
③
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点划线
④
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虚线