We _____________ have lunch at 12: 00 o'clock. [ ]
A. doesn't
B. don't
C. aren't
答案:B
C级绝缘材料的耐热极限温度是()。
A.90℃
B.120℃
C.105℃
D.>180℃
销售商品时给予客户的现金折扣,应在实际发生时计入( )
A.销售费用
B.营业成本
C.财务费用
D.冲减销售收入