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【单选题】
当输入电源屏的交流电源在+15%~-20%范围变化时,压(调压)后的电源允许波动范围应不大于( ):A.
±1％
B.
±2％
C.
±3％
D.
±4％
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举一反三
【单选题】—Where are his parents from? —They ________ from Nanjing. [ ]
A.
are both
B.
both are
C.
are all
D.
all are
【单选题】His English is improving _______, which makes both his parents and his teacher happy.
A.
now and then
B.
little by little
C.
sooner or later
D.
one after another
【简答题】0胎儿血红蛋白是指
【单选题】He loves his parents deeply, ________ are very kind to him.
A.
both of them
B.
both of who
C.
whom
D.
both of whom
【单选题】The __________ of his books among parents and the recommendation of experts both at home and abroad have quickly made him a celebrity educator.
A.
similarity
B.
popularity
C.
personality
D.
possibility
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