测定汽油辛烷值的目的是判断汽油()的优劣。
A、汽化性能
B、抗爆性能
C、动力性能
D、质量
参考答案:B
According to the author biometric technology is____.
A.in the stage of theoretical studyB.widely used in the worldC.about to be out of dateD.developing rapidly
现行20倍速光驱数据传输的速率是______ 。