质量、时间、热力学温度的SI基本单位依次是()
A.千克、秒、开尔文
B.千克、分、开尔文
C.千克、秒、度
D.克、秒、开尔文
E.克、分、度
参考答案:A
Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there.
A.volunteered
B.to volunteer
C.volunteering
D.having volunteering
优位经济效益的表现形式有()、()、()