已知某名义长度30m的钢尺的尺长方程式为L=30m+2.8mm+α(t-20℃)×30m,现用该尺在水平地面丈量得AB距离S′=75.000m,AB间的高差为1.5m,丈量时钢尺温度为31℃。则计算得AB距离的水平距离()。
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