廣義積分,下面說法正確的是()。
A.當(dāng)p=1收斂,p≠1發(fā)散 B.當(dāng)p=1發(fā)散,p≠1收斂 C.當(dāng)p>1收斂,p≤1發(fā)散 D.當(dāng)p>1發(fā)散,p≤1收斂
A、z=f(x,y)在點(diǎn)(x0,y0)處可微,則f(x,y)在點(diǎn)(x0,y0)處連續(xù) B、z=f(x,y)在點(diǎn)(x0,y0)處可微,則f(x,y)在點(diǎn)(x0,y0)處可導(dǎo) C、z=f(x,y)在點(diǎn)(x0,y0)處可導(dǎo),則f(x,y)在點(diǎn)(x0,y0)處可微 D、z=f(x,y)在點(diǎn)(x0,y0)處偏導(dǎo)數(shù)連續(xù),則f(x,y)在點(diǎn)(x0,y0)處連續(xù)
A、連續(xù) B、偏導(dǎo)數(shù)存在 C、偏導(dǎo)數(shù)連續(xù) D、切平面存在