计算发芽率的公式是（）。 ["规定天数内发芽种子粒数\/供试种子粒数x100","发芽种子粒数\/供试种子粒数x100","每日发芽种子粒数\/供试种子粒数x100","全部种子粒数\/供试种子粒数x100"]
If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm, then what is the accumulated dispersion of an ITU wavelength after it travels 200 km?（） ["0 ps\/nm","340 ps\/nm","200 ps\/nm","3400 ps\/nm","More information is needed."]
1W的功率等于（）dBm。 ["40","30","20","10"]
Click the Exhibit button. What is the output if the main（） method is run？（） ["4","5","8","9"]
根据供给润滑剂的方法分类
城市轨道交通的类型？
