使log2(-x)<x+1成立的x的取值范围是( )。
(-1,0)
过敏性紫癜出血原因是()
A.血小板数量减少
B.多种凝血因子消耗
C.血管壁异常
D.凝血因子合成障碍
E.遗传性凝血因子缺乏
The students __________ loudly when the teacher came in.[ ]
A. talked
B. talking
C. were talking
D. to talk