“温度从零下5℃上升了7℃”用算式可表示为______.
温度在0度以上为正,在0度以下为负数,
故温度零下5℃上升了7℃用算式可以表示为-5+7=2℃.
故答案为:-5+7=2℃.
Not only you but also Mary ______to ______after-school activities.
A.hope; join
B.hopes; join
C.hope; take part in
D.hopes; take part in
特发性血小板减少性紫癜(ITP)主要发病机制是
A.脾脏吞噬血小板增多
B.骨髓巨核细胞生成减少
C.骨髓巨核细胞成熟障碍
D.雌激素抑制血小板生成
E.有抗血小板抗体