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【多选题】
Please identify the cause and effect of the problem in the following situation. Teens spend too much time on screen. We ’ re raising our children in captivity and they turn to technology to socialize, learn and decompress.A.
The cause is "Teens spend too much time on screen."
B.
The effect is "They turn to technology to socialize, learn and decompress."
C.
The cause is "We ’ re raising our children in captivity."
D.
The problem is "Teens spend too much time on screen."
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【简答题】为保证在测量80V电压时，误差≤±1%，应选用等于或优于（）级的100V量程的电压表。
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