思想政治教育的“三性”?
参考答案:
主动性、针对性、实效性。
14C测年法是利用14C衰变规律对古生物进行年代测定的方法。若以横坐标t表示时间,纵坐标m表示任意时刻14C的质量,m0为t=0时14C的质量。下面四幅图中能正确反映14C衰变规律的是[ ]
A.
B.
C.
D.
Just use this room for the time being, and we' ll offer you a larger one()it becomes available.
A. as soon as
B. unless
C. as far as
D. until