安全限值 safety limit
安全限值 safety limit
相关考题：
Which of the following is NOT mentioned as a way against traffic accidents?A． Build more highways.B． Conduct stricter driving tests.C． Test drivers every three years.D． Raise the age limit and lay down safety specifications.
你们怎样确保食品安全?A.How about the food safety?B.How do you ensure the food safety?C.What about the food insurance?D.Can you ensure the food safety?
What is the purpose of the limit switch on gravity davits?A.To cut off the power when the davits hit the track safety stopsB.To stop the davits from going too fastC.To cut off the power when the davits are about 12 inches or more from the track safety stopsD.None of the above
记住，安全第一。（）A、Remember: safety first.B、Mind. Safe the first.C、Think of it. Safety is one.D、Think of it. Safety first.
单选题What is the purpose of the limit switch on gravity davits?（）ATo cut off the power when the davits hit the track safety stopsBTo stop the davits from going too fastCTo cut off the power when the davits are about 12 inches or more from the track safety stopsDNone of the above
单选题safety net（）A安全措施B安全网C安全帽D安全防护