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【单选题】
已知两个正弦量为u1＝20sin(314t+π/6)V，u2＝40sin(314t-π/3)V，则（ ）。A.
（A）u1比u2超前60o
B.
（B）u1比u2滞后30o
C.
（C）u1比u2超前90o
D.
（D）不能判断相位差
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【简答题】Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half of home acci...
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