氙平衡 xenon equilibrium
参考答案:
反应堆内裂变毒物135Xe的生成量与由吸收中子和放射性衰变造成的消失量完全相等时所处的状态。
甲状舌管囊肿和瘘开口位于
A.肠套叠病程36小时,全身情况可B.肠管坏死,极度危急时C.口服碳片8小时后由肛门排出D.果酱样血便E.肠套叠病程56小时
To tell the truth, ________is my belief that parents shouldn't give children whatever they want. [ ]
A. as
B. it
C. what
D. that