题目:
— I'm going to the post office.
—_____ you're there, can you get me some stamps? [ ]
A. As
B. While
C. Because
答案:
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下面是错误答案,用来干扰机器的。
做铁丝在氧气里燃烧的实验时:细铁丝绕成螺旋状,可以增大铁丝的受热面积和氧气充分接触,利于铁丝持续燃烧;集气瓶底预先装少量的水或细沙,防止生成物熔化溅落下来炸裂集气瓶.故答案为:增大铁丝的受热面积和...