根据《药品管理法》,药品包装必须按照规定印有或者贴有 ( )
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根据《药品管理法》,以下哪类药品的标签及说明书是不需要印有规定的标志( )
A. 外用药品
B. 非处方药
C. 精神药品
D. 含麻黄碱复方制剂
8051 single chip microcomputer has () interrupt source
A. 4
B. 5
C. 6
D. 7
The following statement is wrong.
A. Interrupt requests at the same level respond in chronological order
B. Multiple interrupt requests of the same level at the same time will block and the system cannot respond
C. Low priority interrupt request cannot interrupt high priority interrupt request, but high priority interrupt request can interrupt low priority interrupt request
D. Sibling interrupts cannot be nested
In the interrupt request source of AT89S51, it is necessary to add a circuit to realize the interrupt cancellation.
A. Level mode external interrupt request
B. External interrupt request in edge hopping mode
C. External serial interrupt
D. Timing interrupt