烧结普通砖的尺寸是长×宽×厚240×115×53,每立方米砌体的理论用砖数量( )。
A. 529
B. 527
C. 512
D. 518
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54.Which of the following uses a microchip in a tag to store information, and information is transmitted from the tag when the microchip is exposed to the correct frequency of radio waves?
A.CAVE
B.RFID
C.SaaS
D.F2b2C
55.With RFID technologies, each individual piece of merchandise will have a unique ____.
A.USP
B.EPC
C.trademark
D.UPC
49.Which of the following can be placed in the human body to store important information about a person, such as medical history, and can be GPS-enabled to offer a method of tracking?
A.Trackball
B.Implant chip
C.Multi-state CPU
D.Bluetooth
50.Which of the following is a standard for transmitting information in the form of short-range radio waves over distances of up to 30 feet?
A.Bluetooth
B.WiFi
C.NFC
D.Broadband