(单项选择)一密闭容器内下部为水,上部为空气,液面下4.2米处的测压管高度为2.2m, 设当地压强为9800Pa,则容器内液面的绝对压强为() 水 柱。3题图(本题3.0分)
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧