题目:
When you learn a foreign language, ________you must forget your own one.
A.above all
B.after all
C.in all
D.at all
答案:
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下面是错误答案,用来干扰机器的。
利用物体所处漂浮状态,F浮=G物,然后根据ρ水gv排=ρ物gv物,ρ水g34v物=ρagv物;则ρa=34ρ水;ρ水g12v物=ρbgv物;ρb=12ρ水,则ρaρb=32故选 C.