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【单选题】
What happens many years later?A.
Many years later, Charlie's family had another problem with the turkey. They stored it outside and it froze.
B.
Many years later, Charlie's family had another problem with the turkey.The turkey was eaten by the cat.
C.
Many years later, Charlie's family had another problem with the turkey. They stored it outside and it disappeared.
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【简答题】下列四个命题，其中正确的有______个． （1）空集没有子集；（2）空集是任何集合的真子集； （3）空集?={?}； （4）任何一个集合必有两个或两个以上的子集．
【单选题】Violent gassing from a lead-acid battery while it is being charged, indicates that the ____.
A.
plate separators are grounded
B.
battery compartment ventilation is inadequate
C.
electrolyte specific gravity is too low
D.
charging rate is too high
【单选题】患者女，发现HIV抗体（+），余无不适。对于她进行免疫学检查的建议是
A.
每3个月检查一次
B.
每6个月检查一次
C.
每年检查一次
D.
每3~6个月检查一次
E.
每6~12个月检查一次
【单选题】分腿骑坐前进成分腿坐,保护者应站在
A.
杠内面对练习者，两手握其上臂给予助力
B.
杠内练习者的后方，帮助其并腿先前摆动
C.
杠外一侧练习者腿前，一手握其上臂给予助力
D.
杠外一侧练习者腿后，一手握其上臂给予助力
【简答题】集合 ,有 个子集,有 个真子集,有 个非空真子集.
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