在资格预审合格的投标申请人过多时，可以由招标人从中选择不少于( )家资格预审合格的投标申请人。

A．3
B．5
C．7
D．10

The principal advantage of NAVTEX radio warnings is that（）.

A.they can be used by mariners who do not know Morse code

B.only an ordinary FM radio is necessary to receive these warnings

C.information on a given topic is only broadcast at specified times

D.they cover a broad spectrum of the radio band allowing reception on almost any type of receiver