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S=I S+NT=G+I S+NT=I+G+EX NT=EX
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drive are driving drove were driving
is driving drove have been driving drove will be driving
drive are driving drove were driving
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Driving I was driving When I was driving Having driven
drive are driving drove were driving
本质安全型Ex“i”，防爆类别：IIC； 隔爆型Ex“d”，防爆类别：IIC； 正压型Ex“p”，防爆类别：II； 浇封型Ex“m”，防爆类别：II。
strike arbitrary valid literature 2. tasty A. astronaut B. hesitate C. ambition D. botany 3 percentage A. politics B. fiction C. accuracy D. cookie 4. digital A. regulation B. seagull C. distinguish D. generally 5. exact A. excavate B. extraordinary C. exit D. example
Driving when I was driving I was driving Having driven
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