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【多选题】
有关精馏操作叙述正确的是(A.
馆实质是多级蒸馏
B.
馆装置的主要设备有：精馆塔、再沸器，冷凝器，回流罐，和输送设备等
C.
馏塔以进料板为界，上部为精馏段，下端为提馏段
D.
馏是利用各组分密度不同，分离互溶液体混合物的单元操作
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【单选题】The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
A.
which
B.
that
C.
as
D.
what
【单选题】Who was Marilyn Monroe?
A.
An American actress and model
B.
A British actress and model
C.
A Russian actress and model
D.
An Australian actress
【单选题】Who was Marilyn Monroe?
A.
An American actress and model
B.
A British actress and model
C.
A Russian actress and model
【单选题】Who was Marilyn Monroe?(微课4)
A.
An American actress and model
B.
A British actress and model
C.
A Russian actress and model
【单选题】The fact has worried many scientists______ the earth is becoming warmer and warmer these years. [ ]
A.
what
B.
which
C.
that
D.
though
【简答题】The fact has worried the people across the world ___________ the earth is becoming warmer and warmer these years. A．what B．which C．that D．where
【单选题】The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
A.
what
B.
which
C.
that
D.
whose
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