SLE病情活动的指标有()
A.免疫球蛋白增高
B.血、尿FDP增高
C.补体降低、ANA、抗dsDNA抗体滴度增高
D.抗Sm抗体阳性
E.ESR加快
参考答案:A, B, C, D
—What are you supposed to do while chatting with friends on the Internet so that the other person doesn't ?
—You are supposed to type quickly.[ ]
A. become annoying
B. feel boring
C. get bored
D. get used to it
角频率ω与频率ƒ之间的关系为()。
A.ω=2πƒ
B.ω=1/ƒ
C.ω=πƒ
D.ω=ƒ