已知a，b互为相反数，则3a+3b-4的值为______．
∵a，b互为相反数，
∴a+b=0，
∴3a+3b-4=3（a+b）-4=-4．
故应填-4．
(2013·高考新课标全国卷Ⅱ)—Are you sure you won’t come for a drink with us?
—________，if you insist.
A．Not at all
B．It depends
C．All right then
D．I don’t care
装置短时间停电如何处理？
