An irrevocable confirmed documentary credit is one that contains the guarantee of payment to the beneficiary by both the issuing bank and confirming bank so long as the terms as condition of the credit are met. ( )
【单选题】Ultraviolet light of wavelength 350 nm and intensity 1.00 W/m 2 is directed at a potassium surface. The maximum kinetic energy of the photoelectrons is ( )
【单选题】Consider: radio waves (r), visible light (v), infrared light (i), x-rays (x), and ultraviolet light (u). In order of increasing frequency, they are: