What are two steps that are taken when a router converts a voice signal from analog to digital form？（） [" sampling"," packetization"," quantization"," serializatio"]
塔式起重机固定式照明装置的电源电压不应超过（） ["36V","110V","220V"]
指出下列句子中通假字并说明意义。善！吾闻穷巷多怪，曲学多辨。
如何实施素质教育？
符合并列条件的两台变压器的接线组别为Y，ZN11的变压器，二次各相电压均达不到并列条件，应当（）进行换相。 ["调整二次电缆","调整一次电缆","绕组重绕","换变压器"]
对尽早诊断流感有价值的实验室检查包括取患者（）或 （）细胞学检测，或直接（）检测流感病毒抗原。
