浪费18度电记为﹣18度电，那么节约4度电表示（ ）度电．
+4
— When did it happen?
— At 5:55 a.m. _____ the morning of December 15. [ ]
A. on
B. in
C. at
D. by
已知(AL)=7，(BL)=9，执行下述指令后(AL)=( )。 MUL AL，BL AAM
A．63
B．3FH
C．6
D．3
