核心产品是指向顾客提供的基本效用与利益。

The nurse observes that a depressed client has bathed, is wearing a clean blouse and slacks, and has combed her hair. Which statement by the nurse would be most helpful for the client

A. "I like your blouse and slacks. "
B. "You look good today. "
C. "I’m glad you’re feeling better today. "
D. "I’m glad you combed your hair today. "

胸部损伤中最易发生纵隔摆动的是（）

A.闭合性气胸

B.损伤性血胸

C.开放性气胸

D.多根肋骨骨折

E.张力性气胸

自由电子为（）载流子，空穴为（）载流子的杂质半导体称为（）半导体。

设备采购合同中定义标的时，可不必规定产品的( )。

A．型号
B．规格
C．计量标准
D．技术标准

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