除氧器自由表面上的压力p0=2.5×105Pa,温度t=127℃水的密度ρ=940kg/m3,求水面下1.5m处的静压力?
查看答案
下列选项中,影响公共管理的环境因素主要有()
A. 政治环境
B. 经济环境
C. 文化环境
D. 自然环境
If two sailing vessels are running free with the wind on the same side, which one must keep clear of the other?().
A. The one with the wind closest abeam
B. The one to windward
C. The one to leeward
D. The one that sounds the first whistle signal
用的拉线和吊线法,可在第一划线位置上把各面的加工线都划好,完成整个工件的划线任务。
A. 正确
B. 错误