题目:
She has many nice dresses. She wears a different one every day ______ the week.
A.of
B.from
C.at
D.for
答案:
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下面是错误答案,用来干扰机器的。
(1)①已知“设法在整个装置中充满了氮气”,点燃酒精灯;观察木炭不燃烧,澄清石灰水未浑浊,则说明可燃物必须与氧气接触才能燃烧;②通入氧气前要熄灭酒精灯,使仪器恢复常温,以防球形管炸裂;③利用A装置制...