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【简答题】
能用配合滴定法直接测定单一金属离子的条件是______。
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反馈参考答案：
举一反三
【简答题】The children often play soccer in the garden and sometimes break Mr Black’s windows. One afternoon Mr Black is at home and reads a book. In a minute he closes his eyes and goes to sleep. At that time ...
【单选题】关于眼部病变的相关疾病说法错误的是()。
A.
青光眼患者的房水压高导致视神经离开眼球，视神经轴突萎缩
B.
视网膜剥离症患者会对光照和阴影产生错觉
C.
色素性视网膜炎是一种与基因突变有关的疾病，表现为渐进的光感受器退行性病变
D.
患有黄斑退化的病人首先表现为周边视觉和夜视的丧失，随后会可能完全致盲
【单选题】— Can John play soccer with us, Mrs Black? — One moment, please. He _____ on the phone to his cousin.
A.
talks
B.
talked
C.
talking
D.
is talking
【简答题】The children often play soccer in the garden and sometimes break Mr Black’s windows. One afternoon Mr Black is at home and reads a book. In a minute he closes his eyes and goes to sleep. At that time ...
【单选题】---Can John play soccer with us , Mrs . Black ? ---Wait a moment, please! He ______on the phone to his cousin .
A.
talks
B.
talked
C.
talking
D.
is talking
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