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【单选题】
当辐射从一种介质传播到另外一种介质中时,下述那种参量不变A.
波长
B.
频率
C.
速度
D.
方向
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反馈参考答案：
举一反三
【单选题】Your friend _____ more if he wants to be thinner. [ ]
A.
needs exercise
B.
needs exercising
C.
need exercising
D.
needs to exercise
【简答题】satisfying needs and wants by creating and exchanging goods and value with others.
【单选题】Every product______before it is sold.
A.
needs to examine
B.
needs to have examined
C.
wants examining
D.
wants to exam
【单选题】a pilot wants to join a group, which kinds of needs he wants to satisfy?
A.
physiological needs
B.
Belongingness and love needs
C.
Self-actualization needs
【单选题】网络营销4C's理论体系不包括( )。
A.
commom wants and needs
B.
Cost to Satisfy wants and needs
C.
Convenience to buy
D.
Communication
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