-3-6+9-11+2.
-3-6+9-11+2=0-11+2=-9.
电气化区段作业有哪些规定?
Computers and mobile phones, though they are indeed making our life______and more ______, have reduced the need for face-to-face communications.
A.easily ; efficient
B.easier; efficient
C.easy ; efficiently
D.easily ; efficiently