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【多选题】
以下属于随机抽样方法的是( )
A.
简单随机抽样
B.
系统抽样
C.
分层抽样
D.
整群抽样
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A.
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A.
避开肘窝穿刺
B.
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C.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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A.
Too expensive.
B.
Too close to the stage.
C.
Uncomfortable.
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