所以，HAL_Delay(uint32_t Delay)函数会在其内部对你传进来的参数偷偷加1。如果延时时间相对于1ms比较...
A 20 s delay between actuation and inhalation reduced the amount recovered to 10.9 micrograms (3.2), but no reduction was seen when using a low static spacer after the same delay. Multiple actuations into the spacer before sampling also reduced the recovery to 24.8 micrograms (3.4) after two...