设由x2+y2+2x-2yz=ex确定z=z(x,y),求
参考答案:
设 F(x,y)=x2+y2+2x-2yz-ex,
则
He is a good cook at home and takes good care of the children, and _____his wife.
A.so does
B.so is
C.the same is true with
D.so it is with
某患者,急性心肌梗死后第2天出现少尿,血压75/50mmHg,烦躁不安,面色苍白,表情淡漠,皮肤湿冷,大汗淋漓,脉细弱无力。应首先考虑的是
A.左心衰竭
B.低血糖反应
C.心源性休克
D.急性肾功能衰竭
E.心肌梗死后综合征