There is(are) ______ allomorphemic word(s) in the following words: cats, men, glass, worked.
A. 1
B. 2
C. 3
D. 4
目前市场大多数含氟牙膏的氟浓度一般为
A. 100~200mg/kg
B. 500~600mg/kg
C. 1000~1lOOmg/kg
D. 2000~2100mg/kg
E. 3000~3100mg/kg
Social, economic and political changes bring about an increasing number of new words. Which of the following words is related to political changes______
A. Moon walk.
B. Watergate.
C. Mao jackets.
D. Talk show.
表示材料的长度和体积随温度变化的物理量是
A. 弹性模量
B. 韧性
C. 热膨胀系数
D. 导热率
E. 比例极限