The MIPS .space directive declares contiguous memory

MIPS uses the two' complement representation of integers

li $t0 ($t1)  is a valid MIPS instruction

MIPS is a register based architecture

MIPS uses 32 bit addressing

bne $r, 20, L causes program execution to move to the line labeled L if the contents of $r is 20   

A canonical N/P-type pull-up/pull-down circuit for a NAND gate has 2 P-type transistors.

A canonical N/P-type pull-up/pull-down circuit for a NOT gate has 2 transistors.

P-type transistors are used in the pull down section of a canonical N/P-type pull-up/pull-down circuit.

The pull up part of a canonical N/P-type pull-up/pull-down circuit is directly connected to the 1 rail.

A canonical N/P-type pull-up/pull-down circuit for a NAND gate has 2 transistors.

N-type transistors are good transmiittors of 1

A P-type transistor is enabled by input 0.