用作单片机地址锁存器的芯片一般有()等。
A.16D触发器
B.8D触发器
C.32位锁存器
D.16位锁存器
E.8位锁存器
参考答案:B, E
91. ______ finding solutions, it is unthinkable to solve all the problems the same way throughout the country.
A.As if
B.As of
C.As for
D.As against
超声波探伤探头位置以声速中心刚好穿过钢板厚度的()处为最适宜。
A.1/4
B.1/2
C.3/4
D.1/10