T12和T8两种钢号材料比较（）。

[问答题] T8、T12为碳素工具钢，其含碳量分别为多少？

[单选题]钢号T8，表示钢的含碳量为（）。A .0.08%B . 0.8%C . 8%

[单选题]电气照明中，经常会提到T5、T8、T12荧光灯管。此处T5等符号的准确含义是（）。A . 灯管的直径B . 灯管的长度C . 灯管的效率代号D . 灯管的系列号

[判断题] 碳素工具钢的牌号，如T8，T12，该数字表示钢的最低冲击韧性值。A . 正确B . 错误

[单选题]为什么钳工锯切T8、T10、T12等圆钢时比锯10、20钢圆钢时费力，锯条也容易磨损？（）A . 10、20钢太硬B . T8、T10和T12钢太软C . T8、T10和T12钢太硬

[单选题]要将Q235钢与T8钢两种材料区分开来，用（）方法既简便又准确。A . 拉伸试验B . 硬度试验C . 弯曲试验D . 疲劳试验

[单选题](T12)A．PROPERTYB．RUNC．ON A.ALL OTHER FORMS OF TOBACCO(T7)______SCHOOL GROUNDSB．IF THEY"RE ON SCHOOL(T8)______C．SMOKERS ARE BEING(T9)______NOT JUST OUT OF SCHOOL BUILDINGS AT MANY COLLEGES,(T10)______BUT OFF THE PREMISES.ON NOV.19,THE UNIVERSITYOF KE

[单选题](T12)A．DEFENDINGB．UPC．COPE A.KEEP LIVING(T7)______TO THAT IMAGEB．IF YOU CAN(T8)______WITH THREE DAYS RUNNINGC．WAYS OF(T9)______AN IDEA WHAT YOU DESCRIBE IS A HABIT OF LYING THAT IS MORE SERIOUS THAN THIS.I SUSPECT THAT THELIES YOU TELL ARE(T10)______

[单选题](T12)A．WARNB．AWAYC．OUT A.MEN AND ANIMALS MIGHT SOON DIE(T7)______B．THEIR HANDS WERE BURNT(T8)______C．FEAR WOULD NOT(T9)______IT TO KEEP AWAY FROM THE FIRE FEAR AND ITS COMPANION PAIN ARE TWO OF THE MOST USEFUL THINGS THAT MEN AND ANIMALS POSSESS, IF

[单选题](T12)A．POSITIVEB．BEHINDC．RESULT A.AFRAID THEIR COUNTRIES WILL BE LEFT(T7)______B．WHAT WAS LESS VISIBLE THEN, HOWEVER, WERE THE NEW,(T8)______FORCESC．AS A(T9)______ A GREAT DEAL OF ATTENTION IS BEING PAID TODAY TO THE SO-CALLED DIGITAL DIVIDE—THE DIVI