问题
选择题
— Now, where is my purse?
— _____! We'll be late for the picnic.[ ]
A. Take your time
B. Don't worry
C. Come on
D. Take it easy
答案
答案：C
搜题请搜索小程序“爱下问搜题”
— Now, where is my purse?
— _____! We'll be late for the picnic.[ ]
A. Take your time
B. Don't worry
C. Come on
D. Take it easy
答案：C
下表列出了常见几种合金的成分及主要性质
| 名称 | 高速工具钢 | 武德合金 | 镍铬合金 |
| 成分 | 铬3.8～4.4% 钨11～19%、钒等 | 铋50%，铅25%， 锡、铬 12.5% | 镍80%，铬20% |
| 性质 | 耐磨，硬度大 | 熔点很低（70℃） | 熔点高，电阻大 |