All of the tickets for two real estate seminars, F and G, were either purchased or given away, and the ratio of F tickets to G tickets was 2 to 1. Of the total number of F tickets and G tickets, what percentage was purchased ？（）
(1)The total number of F tickets and G tickets is 240.
(2)Of the F tickets, exactly 60 percent were purchased, and of the G tickets, exactly 80 percent were purchased.

A.条件（1）充分，但条件（2）不充分.

B.条件（2）充分，但条件（1）不充分.

C.条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.

D.条件（1）充分，条件（2）也充分.

E.条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.

离心式氯气压缩机组由哪几个系统组成？（）

A.氯气系统、润滑系统、干燥空气系统

B.润滑系统、干燥空气系统、仪表控制系统

C.氯气系统、润滑系统

D.氯气系统、润滑系统、干燥空气系统、仪表控制系统