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【单选题】
实验调查成功的关键是（）A.
确定实验方法
B.
确定实验时间
C.
选择实验对象
D.
合理科学的实验设计
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
12 %
B.
10%
C.
15%
D.
16 %
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A.
can
B.
ought to
C.
have to
D.
must
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