已知x+2y-6z=0,3x-y=4z,则 2002xy+ y 2 -4 z 2 xy-yz+xz 的值为______.
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【单选题】Which option is the most appropriate patterns of salutation in an English letter when you know the recipient’s name and have intimate relationship? ( ) ( 英文信件中如果知道收信人姓名且关系亲密,下列称呼哪一项最合适? )
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【单选题】Which option is the most appropriate patterns of salutation in an English letter when you know the recipient’s name and have intimate relationship? ( ) ( 英文信件中如果知道收信人姓名且关系亲密,下列称呼哪一项最合适? )
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