A:a≤−4
B:−4≤a≤6
C:a≤−4 或 a≥6
D:a≥6
- When is Lang Lang's concert?
- It's three o'clock the afternoon of December 18th.
人体组织液中的O2若要进入组织细胞中参与氧化有机物,这些氧分子要通过几层生物膜( )
take not sweep come march collect stand
按图所示的电路图连接电路;
闭合开关,用电压表测出L1两端的电压;在测L2两端的电压时,明明同学为了节省实验时间,采用以下方法:电压表所接的B接点不动,只断开A接点,并改接到C接点上;测出AC间的电压.
UAB/V
UBC/V
UAC/V
2.4
1.4
3.75