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【多选题】
从系统结构和功能上讲，条码识读系统是由（）组成。A.
译码
B.
光电转换器
C.
扫描系统
D.
信号整形
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Have you worked there long?
A.
Yes, I have worked there for more than fif years.
B.
I am bored.
C.
I like my job very much.
D.
I don't know.
【简答题】As you worked late yesterday, you ______ have come this morning. A. needn’t B. mayn’t C. can’t D. mustn’t
【单选题】As you worked late yesterday,you_________have
A.
19. As you worked late yesterday,you_________have comethis morning. ( 全国 2) A.mayn’t
B.
can’t
C.
mustn’t
D.
needn’t
【简答题】It is necessary for you to have worked in this sector before.
【单选题】—Have you worked here since you graduated? —No, I ____________at a factory in Beijing for six years.
A.
would work
B.
have worked
C.
had worked
D.
worked
【简答题】学生注意转移快慢的标志是速度，速度受哪些方面的因素影响?
【简答题】If you have worked hard all day, you feel like this. t______
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