CPU is in an iron box together with other devices such as disk drives,a main memory and a switching

A.如果disk经常不等于0，且在b中的队列大于3，表示io性能不好

B.vmstat -d指令可查看磁盘的读写情况

C.如果CPU的id经常少于40，表示cpu的负荷很重

D.如果IO的bi，bo长期不等于0，表示内存不足

设CPU内部结构如图9.4所示，此外还设有B. C、D. E、 H、L六个寄存器，它们各自的输入和输出端都与内部总线相通，并分别受控制信号控制（如Bi为寄存器B的输入控制; Bo 为B的输出控制)。要求从取指令开始,写出完成下列指令所需的全部微操作和控制信号。（1) ADDB, C （B)+（C)→B)（2) SUB A,H（（AC)-（H)→AC)

Permanent magnetism is found in ______.

A.hard iron

B.soft iron

C.vertical iron only

D.horizontal iron only

A.iron in

B.to iron at

C.ironing out

A.steel and iron

B.iron steel

C.iron and steel

D.steel iron

A.of

B.in

C.with

D.for

He was hit on the head by a piece of iron and was knocked ______ .

A．unconscious

B．subconscious

C．mindless

D．brainless

__.

A．more beautiful

B．new and modern

C．much stronger

D．easier to transport