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【单选题】
根据新型冠状病毒肺炎防控方案(第四版),新型冠状病毒肺炎的潜伏期多为？A.
3-5天
B.
3-7天
C.
3天
D.
7天
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反馈参考答案：
举一反三
【单选题】_______ is a macroscopic science that studies the interrelationship between the various equilibrium properties of a system.
A.
Kinetics
B.
Thermodynamics
C.
Statistical mechanics
D.
Quantum chemistry
【单选题】Which of the following is the finding about Chinese mothers in various studies?
A.
Underlining academic success is good for children and parents should foster the idea that learning is fun.
B.
Academic achievement reflects successful parenting and if child ren don’t do well at school, then parents are to blame for it.
C.
Parents spend more time every day in staying with their children.
D.
Parents encourage their children to participate in sports teams.
【简答题】Various studies have shown that the mountain village has a very ______________ population.
【单选题】Based on recent studies made by various scholars， which of the following factors plays a fundamental role in man‘s longevity? 查看材料
A.
Genes.
B.
Eating habits.
C.
Environment.
D.
Medical condition.
【简答题】换向阀的作用是利用（ ）和阀体的相对运动来接通、关闭油路或变换油液通向执行元件的流动方向，以使执行元件启动、停止或变换运动方向。
【简答题】换向阀的作用是利用( )和( )的相对运动来接通、关闭油路或变换油液通向执行元件的流动方向,以使执行元件启动、停止或变换运动方向。
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