The dispersion of a non-zero dispersion shifted fiber is 6 ps/nm*km at 1550 nm and 10 ps/nm*km at 1610 nm. What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps/nm？（） [" none"," -600 ps\/nm"," -200 ps\/nm"," +200 ps\/nm"," +600 ps\/nm"]
沥青混凝土路面坑槽修补方法包括（）等。 ["热料热补","热料冷补","冷料冷补","超薄磨耗层修补"]
喇叭的调整包括（）和（）两项。
与精神分裂症预后有关的是（） ["病前有无精神因素","家族史中有无典型精神分裂症","病前性格内向与否","起病急或缓","症状以阳性还是阴性为主"]
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CAD
