线形非晶态高聚物在温度一形变曲线上显示了两个热转变的特征温度是()。
A.脆化温度
B.玻璃化温度
C.黏流温度
D.分解温度
参考答案:B, C
Mum added lots of _______ on the food but it still wasn't _______. [ ]
A. salt; enough salt
B. salt; salty enough
C. salty; enough salt
D. salty; salt enough
一条环形赛道前半段为上坡,后段为下坡,上坡和下坡的长度相等,两辆车同时从赛道起点出发同向行驶,其中A车上下坡时速相等,而B车上坡时速比A车慢20%,下坡时速比A车快20%,问A车跑到第几圈时,两车再次齐头并进( )
A.23B.22C.24D.25