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【判断题】
信息系统的防御能力大部分是对未知的破坏行为进行防御。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】人体主要造血原料是
A.
铁、维生素B 12
B.
蛋白质、维生素B 12 、叶酸
C.
铁、维生素B 12 、叶酸
D.
Fe 3+ 、蛋白质
E.
Fe 2+ 、蛋白质
【单选题】According to Dr. Malina, the decrease in physical activity amongst young Americans is mainly due to______.
A.
a lack of physical education
B.
an unhealthy diet
C.
a lack of opportunities for physical exercise
D.
the fact there are more opportunities for them not to exercise
【简答题】A survey has found that in adolescence (青春期) a lack of physical activity is connected with emotional and behavioral problems. More than 7,000 agers in Finland took part in the survey that judged t...
【单选题】Time needed for physical activity depends on______.
A.
health
B.
effort
C.
money
D.
kinds of activities
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