(单选题)28: The atomic weight of helium is ______ that of hydrogen. ()
A: heavier four times than
B: four time heavier than
C: than four times heavier
D: four times heavier than
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(单选题)28: The atomic weight of helium is ______ that of hydrogen. ()
A: heavier four times than
B: four time heavier than
C: than four times heavier
D: four times heavier than
(责任编辑:admin) |