[18-(12+13)×8]÷56,
=[18-56×8]×65,
=18×65-56×65×8,
=21.6-8,
=13.6.
员工办理退养有()、()、(),经石化公司劳资培训处批准后方可办理退养手续。
—Would you like to come to dinner tonight?
—I will ________ I'm not too busy. [ ]
A. and
B. if
C. so
D. but