“短声”指历时:() ["约1秒的笛声","约1~2秒的笛声","约2~3秒的笛声","约4~6秒的笛声"]
什么是塔板开孔率?
什么是难挥发组分?
本船航向010,在右舷45度处发现来船红灯消失而见到绿灯,则来船的航向约为:() ["337.5°或225°","235°","225°","337.5°"]
()还具有非接触性检验高、低压线路是否断电和断线的功能。 ["A.回转式高压验电器","B.近电报警器","C.低压验电笔","D.声光型高压验电器"]
对于饱和蒸汽进料,分馏塔内气液两相流量分布如何?