问题
单项选择题
（）钢的硬度、耐磨性、耐热性能均高于渗碳钢和渗氮钢。
A.渗碳
B.渗硼
C.渗钒
D.渗硫
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
（）钢的硬度、耐磨性、耐热性能均高于渗碳钢和渗氮钢。
A.渗碳
B.渗硼
C.渗钒
D.渗硫
参考答案：B
| 阅读下面的短文，并用方框中的词语填空。 | |
| |
| My name is Paul Brown. I’m English，and I'm 1 years old. My birthday is November 2 . I usually get up at 3 . My favorite subject is 4 . I like it because it’s 5 . I play sports in the afternoon. I can play 6 and basketball. I go to the movies on weekends. My favorite actor is 7 ． |