王师傅做200个零件，合格198个，合格率是______．
答：合格率是99%，
故答案为：99%．
What do you do on Saturdays? [ ]
A. I often paint.
B. I often play ping-pong.
C. I often play football.
危险作业项目在开工前应做好哪些工作？
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