皮皮学，免费搜题
登录
搜题
【单选题】
数列{a n }中a 1 =1，a 5 =13，a n+2 +a n =2a n+1 ；数列{b n }中，b 2 =6，b 3 =3，b n+2 b n =b 2 n+1 ，在直角坐标平面内，已知点列P 1 （a 1 ，b 1 ），P 2 （a 2 ，b 2 ），P 3 （a 3 ，b 3 ），…，P n （a n ，b n ）…，则向量 的坐标为 [ ]A.
（3015，8[（ ） 1005 -1]）
B.
（3012，[（ ） 1005 -1]）
C.
（3015，[（ ） 2010 -1]）
D.
（3018，[（ ） 2010 -1]）
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】[性状鉴别]略呈椭圆形或类球形,长1.2~ 1.8cm,直径0.8~ 1.4cm。2 )表面浅黄棕色至红棕色,表面有细纵纹和较宽的脉纹;一端中心呈乳头状突起,深棕色,多有裂口,其周边略下陷。3质硬,种皮薄,不易剥离。 子叶2,黄白色,肥厚,中有空隙,具绿色莲子心。4气微,味甘、微涩; [功能]补脾止泻,止带,益肾涩精,养心安神
【单选题】莲子具有的功效是
A.
益肾固精，补脾止泻，除湿止带
B.
敛肺止咳，补脾止泻，收涩止带
C.
益肾固精，补脾止泻，宁心安神
D.
益肾固精，补脾止泻，止带养心
E.
益肾固精，补脾止泻，养血安神
【单选题】Which is inappropriate for a professional convention staff to do?
A.
Keep a neat, well-groomed appearance
B.
Talk about politics and religious belief to know the guests’ culture
C.
Have friendly and direct eye-contact with meeting delegates
D.
Have proper body language and smile to welcome guests
【简答题】A．A system which trains doctors. B．A group of experts who can provide professional advice. C．A computer program which can provide professional advice. D．A system which trains computer experts.
【单选题】All of the following are mentioned in the passage as circumstances in which professional service firms can benefit from offering an unconditional guarantee EXCEPT______
A.
The firm is having difficulty retaining its clients of long standing.
B.
The firm is having difficulty getting business through client recommendations.
C.
The firm charges substantial fees for its services.
D.
The adverse effects of poor performance by the firm are significant for the client.
E.
The client is reluctant to incur risk.
【单选题】莲子具有的功效是
A.
敛肺止咳，益气生津，补益肝肾
B.
涩肠止泻，益气生津，益肾养心
C.
养心安神，益气生津，补脾止泻
D.
涩肠止泻，益肾养心，固精止带
E.
补脾止泻，益肾养心，固精止带
相关题目：
参考解析：
知识点：
题目纠错 0
发布
