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【简答题】
设f(t)=f 1 (t)i+f 2 (t)j+f 3 (t)k，g(t)=g 1 (t)i+g 2 (t)j+g 3 (t)k, ， ， 证明： ．
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举一反三
【单选题】According to the author, seniority pay favors
A.
good teachers with master’s degrees.
B.
young and effective teachers.
C.
experienced and effective teachers.
D.
mediocre teachers of average quality.
【单选题】The two doctors might support which of the following statements?
A.
Left-handers stand a better chance of winning than right-handers in violence.
B.
Left-handers are more likely to commit crimes than the right-handers.
C.
Left-handers are directly responsible for the violence in traditional societies.
D.
There is no evidence that left-handers are more violent than right-handers.
【单选题】()构筑旅游安全保障网有哪些措施?
A.
加强安全制度建设、强化重点领域和环节得监督
B.
强化旅游标准管理，全面提升旅游设施和服务得质量水平
C.
加大旅游标准化宣传推广和培训工作
D.
全面提高旅游标准覆盖率
【简答题】民乐合奏形式多种多样,有 , , 。
【简答题】Which facilities might influence housing prices?
【单选题】Mr. Lin is one of in our school. [ ]
A.
good teachers
B.
better teachers
C.
the best teachers
D.
the best teacher
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