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【T2】 A.TO OBTAIN B.MADE OF C.IS WORTH A.IT IS CHEAPER【T1】______SILVER B.THE COINS WERE ACTUALLY【T2】______SILVER C.THE SILVER IN COINS【T3】______MUCH MORE LESS THAN 40 YEARS AGO IN THE UNITED STATES, IT WAS COMMON TO CHANGE A ONE-DOLLAR BILL FOR A DOLLAR'S WORTH OF SILVER.THAT IS BECAUSE【T4】______.BUT THOSE DAYS ARE GON E.THERE IS NO SILVER IN TODAY'S COINS.WHEN THE PRICE OF THE PRECIOUS METAL RISES ABOVE ITS FACE VALUE AS MONEY, THE METAL WILL BECOME MORE VALUABLE IN OTHER USES.SILVER COINS ARE NO LONGER IN CIRCULATION BECAUSE【T5】______THAN THEIR FACE VALU E.A SILVER FIRM COULD FIND THAT【T6】______BY MELTING DOWN COINS THAN BY BUYING IT ON THE COMMODITY MARKETS.COINS TODAY ARE MADE OF AN ALLOY OF CHEAPER METALS.
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【多选题】下列有关两岸关系的叙述正确的有( )
A.
推动两岸关系和平发展、携手致力民族复兴,是符合民族整体利益、顺应时代潮流、造福两岸同胞、得到两岸同胞拥护的正确道路。
B.
不管经历多少风雨,两岸同胞在民族、文化认同和情感上从未分离。
C.
尽管数十年来两岸关系跌宕起伏,但总体趋势是向前发展的。
D.
两岸是密不可分、休戚与共的命运共同体。
【简答题】一台100MVA、20kV、60Hz的三相同步发电机，连接到一台100MVA、20/400kV的三相变压器上。同步发电机的电抗标幺值和时间常数为 X d =1.25p.u.，X' d =0.25p.u.，X" d =0.15p.u. τ a =0.3s，τ' d =0.50s，τ" d =0.035s 变压器电抗为0.25p.u.。发电机空载且在额定电压下运行，变压器二次发生三相对称短路，求：
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