一般食品中还原糖的测定方法有 直接滴定法 和 高锰酸钾法
A. 直接滴定法
B. 高锰酸钾法
C. 间接滴定法
D. 沉淀滴定法
Which one is not the peripheral device?
A. printer
B. digital camera
C. scanner
D. CPU
Which of the following are not handheld computers?
A. Enhanced media players
B. Desktop computers
C. Smartphones
D. Tablets
Without ( ) in the system unit of computer, the monitor can’t display images.
A. sound card
B. network card
C. keyboard
D. graphics card
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