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When a liquid freezes to become a solid,
Q3: A car starts from rest and reaches
Q4: The speed of a chemical reaction is
Q6: The less the mass of a main-sequence
Q16: If radium and chlorine combine to form
Q17: Photons have<br>A)no charge.<br>B)charges smaller than
Q28: The sun<br>A)attracts light waves passing nearby.<br>B)repels light
Q34: If a certain reaction is endothermic, the
Q34: A wave of amplitude A interferes with
Q36: A Celsius thermometer and an absolute thermometer
Q38: The 2.5-kg head of an ax exerts