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【简答题】
比较下列氧化物的酸碱性,按酸性减弱、碱性增强的顺序是 。 Al 2 O 3 , B 2 O 3 , BaO , CO 2 , Cl 2 O 7 , SO 3
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皮皮学刷刷变学霸
举一反三
【单选题】--This is the first time I ____ pictures with my own camera. --It’s time that you ___ a picture of me.
A.
took; took
B.
took; will take
C.
have taken; took
D.
will take; have taken
【单选题】_________ first time I met him in his office, he shook me by _________ hand warmly and then introduce himself to me.
A.
The; 不填
B.
The; the
C.
The; a
D.
A; 不填
【单选题】first time I met him in his office, he shook me by hand warmly and then introduce himself to me.
A.
The;不填
B.
The; The
C.
The; a
D.
A；不填
【单选题】I have no experience related to _______, since it's the first time for me to handle such a problem. [ ]
A.
call upon
B.
live on
C.
take on
D.
draw upon
【简答题】Please show me _______to send an e-mail, John．It's the first time for me to do it.
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