（）是评定柴油自燃性能好坏的质量指标，一般而言，柴油的发火性延迟时间越（），其燃烧性能越好。
参考答案：十六烷值；短
Which of the following is closest in meaning to what you’ve just heard().
A.You caught me so you can put me in jail.
B.You can’t escape because I got hold of you.
C.You’ve got my ideas.
D.You’ve asked a question I can’t answer.
大陆式握拍在正、反手击球时（）交换握拍方法。
