[ -sqrt (2),sqrt (2)] D. [ -sqrt (2),0]

sqrt (2)-|||-C. sqrt (34)-|||-○ D. sqrt (2)

[ sqrt (3),2] -|||-C. [ -2,-sqrt (3)] D. [ -2,-sqrt (3)] cup [ sqrt (3),2]

+x+sqrt (2)=0 C. -x-sqrt (2)=0 D.

sqrt (2)pi :2 C. sqrt (2)pi :4 D. sqrt (2)pi :8

sqrt (2)a ; C.2c; D. sqrt ({a)^2+4(c)^2}

C. D. sqrt (2gH) E.2AgH-|||-sqrt (2gH) sqrt (2{A)_(g)H}一盛水大容器，水面离底距离为H，容器的底侧面有一面

sqrt (2)pi -|||-C. dfrac (sqrt {2pi )}(4)-|||-D. dfrac (sqrt {2pi )}(8)

-3sqrt (2) C. -2sqrt (3) D. -1

=2sqrt (2) D. Delta PAC 的面积为 sqrt (3)

[ 0,dfrac (pi )(2)] D. [ -sqrt (dfrac {pi )(2)},0]