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【简答题】
某研究学习小组经过查阅资料发现，锰（Mn）也能排入下列金属活动性顺序中： K、Ca、Na、Mg、Al、Mn、Zn、①、②、③、④、⑤、⑥、⑦、Pt、Au （1）上述金属活动性顺序中⑥的元素符号是：______； （2）已知锰盐中锰元素显+2价．写出一个有参加的置换反应______．
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反馈参考答案：
举一反三
【单选题】4 What does the expression "kicks off" mean?
A.
It means that the referee should blow his whistle.
B.
It means that the ball is kicked for the first time.
C.
It means that the players should stop playing.
【简答题】接入电源,测试 J4 点电位为 ,调节 RP ,测量该电源输出( J5 )电压的调节范围是: V --- V ,当输出电压最低时, 亮,当输出 11V 时, 亮,当输出最高时 , 亮。
【简答题】叶轮圆盘旋转的速度,分为叶轮进口和出口两种,这一旋转速度在速度三角形中称为( )速度。
【简答题】A．They should help other families the way they have been helped. B．They should offer all baby animals to their poor neighbors. C．They should submit a report of their needs and goals. D．They should pro...
【单选题】Players should be allowed to ______ money from advertising.
A.
earn
B.
entertain
C.
recommand
D.
check
【多选题】What characteristics do diving players should have?
A.
strength
B.
flexibility
C.
air awareness
【单选题】The captain commanded that the players _________ their paces
A.
should slow
B.
slowed
C.
could slow
D.
slows
相关题目：
【多选题】What characteristics do diving players should have?
A.
strength
B.
flexibility
C.
air awareness
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