在强酸性溶液中能大量共存，且溶液为无色透明的离子组是 A．N

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问题选择题

在强酸性溶液中能大量共存，且溶液为无色透明的离子组是

A．Na⁺、Al³⁺、SO₄²^-、NO₃^-

B．Ba²⁺、Na⁺、SO₄²^-、NO₃^-

C．K⁺、Mg²⁺、MnO₄^-、SO₄²^-

D．K⁺、Na⁺、NO₃^-、HCO₃^-

答案

答案：A

选择题

That hero who died in the war was so brave that he never ____ to the enemies until death. [ ]

A. gave up

B. gave out

C. gave in

D. gave away

单项选择题

鉴定煤尘爆炸性利用“刻槽法”采样时，从顶板到底板刻划两条平行直线，刻槽深（）mm。

A.50

B.75

C.100

D.150