把24分解质因数是（） A．24=2×3×4 B．24=2×2×3×3 C．24=2

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问题选择题

把24分解质因数是（　　）

A．24=2×3×4

B．24=2×2×3×3

C．24=2×2×2×3

答案

因为A中4不是质数；B中2×2×3×3=36了；C中都是质数，并且2×2×2×3=24；

故答案为C．

填空题

根据首字母及句意补全单词

1. Edison was a t_____ and great inventor.

2. He was good at playing the violin when he was a child, so he became a v_____ later.

3. She b_____ a famous singer when she was 28 years old.

4. She spent all her free time p_____ the piano.

5. Mr Smith is a l_____ old man.

单项选择题

一患者车祸后2小时送至医院，诉咳嗽、胸部疼痛。查T36.5℃，P130次／分，R30次／分，BP90／60mmHg，神清，右胸部压痛明显，右肺呼吸音低，下肢有骨折征。胸片示：侧液气胸。创伤种类为（）

A．穿透伤

B．盲管伤

C．开放伤

D．挤压伤

E．闭合伤