最轻的塑胶是（）
A.PC 聚碳酸脂
B.ABS 丙烯氰-丁二烯-丙乙烯
C.PP 聚丙烯
D.PVC 聚氯乙烯
参考答案：C
It was lucky that little Jack was not at home when the fire broke out; otherwise, he____his life.
A．had lost
B．would lose
C．would have lost
D．might lose
发包人应在收到承包人的工程进度款支付申请后( )天内核对完毕，否则，从次日起承包人递交的工程进度款支付申请视为被批准。
A．7 B．14C．21 D．30
