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【单选题】
已知向量 ，若 与 共线，则 等于A.
B.
2
C.
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【简答题】冷藏库的作用、分类和组成？论述压缩机及一般选择原则;重力供液制冷系统的优点、缺点？
【单选题】Why didn’tthewashwomanlive together with her son?
A.
Because her son was not rich.
B.
Because her son was ashamed of her.
C.
Because her son was dead.
D.
Because she didn’t get along well with her daughter-in–law.
【简答题】A．Limit the amount of television her son watches. B．Forbid her son to watch television. C．Be firm when setting limits. D．Help her son gain self-control.
【简答题】求曲线y=sinx的弧微分．
【单选题】Whom is the woman buying the gift for?
A.
Her brother's son.
B.
Her brother.
C.
Her son.
【单选题】Why is the speaker worried about her son?
A.
Because her son is too young to take care of himself.
B.
Because her son easily gets upset.
C.
Because her son is addicted to iPad .
D.
Because her son doesn’t like to go to school
【简答题】制冷系统的分类及组成
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