【单选题】A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 12.2 cm. Atmospheric pressure was 783 mm Hg. The pressure of...
【简答题】A.The pressure for high standards in American education. B.The kids' readiness for active participation in learning. C.The prevalent eagerness to improve academic performance. D.All of the above.