脑血栓的错误护理措施是
C
暂无解析
Heaskedmewhethermybrother________(fly)toBeijing.
求函数f(x,y)=x^2+y^2在条件2x+3y=1下的极值.
Thepoorcountriesareextremely_______tointernationaleconomicfluctuations
（）
It________asashocktorealizethatIwasnotaloneintheroom.