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【简答题】
已知向量 a ，b 且a，b满足|ka+b |= |a-kb| ， (1)求a与b的数量积用k表示的解析式 ； (2) a能否和b垂直？a能否和b平行？若不能，请说明理由；若能，请求出相应的k值； (3)求向量a与向量b的夹角的最大值。
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举一反三
【简答题】Strong complaints 强硬投诉
【简答题】cattle
【单选题】how to solve complaints.
A.
handling complaint
B.
steps to deal with complaints
C.
Complaints Department
D.
feedback
【多选题】Common types of customers' complaints include
A.
complaints about service quality
B.
complaints about service attitude
C.
complaints about products and facilities
D.
complaints about accidental events
【简答题】A．questions B．inquiries C．problems D．complaints
【单选题】how to solve complaints
A.
steps to deal with complaints
B.
room complaint
C.
food complaint
D.
complaint letter
【单选题】The three main types of complaints are:
A.
noise complaints, bad odors and rude employees
B.
noise complaints, false advertising and incompetence
C.
employee behavior, dishonesty and property related
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