问题
The atomic weight of oxygen is_____than ______of the hydrogen.
A:15 times heavier; that
B:15 times heavier: those
C:16 times as heavier; that
D:16 times as heavy; those;
B:15 times heavier: those
C:16 times as heavier; that
D:16 times as heavy; those;
正确答案是：
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