你已经绘制了一个命名为Queen的ggplot对象，现在想将其改为无背景、无网格线的样式，且图的标题字体加粗、大小为12磅，新绘制的对象保存为King。所需要的命令为（） A: King<-theme_classic()+theme(plot.title=element_text(face="bold",size=12)) B: King<-Queen+theme_classic()+theme(plot.title=element_text(face="bold",size=12)) C: King<-Queen+theme_bw()+theme(plot.title=element_text(face="bold",size=12)) D: King<-Queen+theme_bw()+theme(axis.ticks=element_line(color="grey",size=1.2))

当MACHTRIMFAIL灯亮时，应当限制马赫数在多少（） A: Classic：0.70-NG：0.80 B: Classic：0.74-NG：0.82 C: Classic：0.65-NG：0.78 D: Classic：0.70-NG：0.78

19. What is the theme of the contest for this year? The theme is __________________.

The basic characteristics of theme park are theme and entertainment.

classic ________________ (典型临床表现)

Classic characterthe little ____________.

The theme park in China has experienced three periods: theme park represented by miniature landscape, theme park based on transplantation and imitation, and theme park with equal emphasis on leisure, entertainment and education.

“Classic Blues”是什么意思？

That match was a ______. A: classic B: classical

Which book is the one of THE FOUR BOOKS? A: THE CLASSIC OF MUSIC B: THE GREAT LEARNING C: THE SPRING AND AUTUMN ANNALS D: THE CLASSIC OF RITES