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【单选题】
(中) 一平面机械波在弹性介质中传播,下述各结论中正确的是( )。A.
介质的振动动能增大时,其弹性势能减小,总机械能守恒
B.
介质的振动动能和弹性势能都作周期性变化,但两者相位不相同.
C.
介质的振动动能和弹性势能的相位在任一时刻都相同,但两者数值不同
D.
介质在其平衡位置处弹性势能最大
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predict
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A.
Predict
B.
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【单选题】Which of the following statements is NOT an argument against Bowlby's theory?
A.
Many studies show that day care has a positive effect on children's development.
B.
Parents find the immediate effects of early day care difficult to deal with.
C.
Separation from parents for very young children is common in some traditional societies.
D.
Day care is safe, otherwise there wouldn't be so many nursery schools.
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