单项选择题

配位化合物中中心原子和配体间、内界和外界间分别以什么键结合？

A、配位键、离子键
B、配位键、共价键
C、共价键、配位键
D、离子键、共价键

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单项选择题

Don’t you think that you should learn how to deal with difficult__________ ?

A、situations
B、conditions
C、positions
D、locations