因为x-2+(y-12)2=0,
所以x-2=0y-12=0,解得x=2y=12,
所以原式=12+12=22+22=2.
In the UK, a woman usually doesn’t like to be asked ____________.
A.whether she had been married
B.what is her age
C.how much she weighs
D.where she comes from
设计压力小于等于0.8MPa的钢管强度试验压力为()。
A、2倍的设计压力
B、1.25倍的设计压力
C、1.30倍的设计压力
D、1.5倍的设计压力且不小于0.4MPa