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【单选题】
对称三相电路中,线电压 与 之间的相位关系是_______。A.
超前 60°
B.
落后 60°
C.
超前 120°
D.
落后 120°
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皮皮学刷刷变学霸
举一反三
【单选题】Today, bank runs are not a major problem for the U.S. banking system because
A.
bank runs are now illegal.
B.
banks now hold 100 percent of their deposits in reserve.
C.
banks are now all government-operated.
D.
the federal government now guarantees the safety of deposits at most banks.