特低电压可分为（）类型。 A: SELV B: PELV C: HELV D: FELV

Suzhou itself was founded as the Wu capital in the 6th century B.C. by the order of King _______. A: Liao B: Fuchai C: Helv D: Wu Zixu

Suzhou itself was founded as the Wu capital in the 6th century B.C. by the order of King _____. A: Helv B: Fuchai C: Wu Zixu D: Sunqun