在矿物摩氏硬度计中,摩氏硬度为7的矿物是()
A. 石英
B. 长石
C. 方解石
D. 金刚石
A case can protect your iPod from being bent, dropped or crushed.
A. 对
B. 错
You should fit a connector(接头) into a port(端口) correctly and join them with ease.
A. 对
B. 错
iPod playtime might shorten if it’s stored in a place where the temperature is below 0oC.
A. 对
B. 错