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))

"We Are the Champions" is a song by Queen and was the theme song of the 1994 World Cup.

通频带可用BW表示,正确的是( )。 A: BW=fL+fH B: BW=fH C: BW=fH-fL D: BW=fL

极低出生体重儿指（ ）。 A: BW＜1500g B: BW＜500g C: BW＜1000g D: BW＜2000g

The head of the phrase the Queen Mary is . A: the Queen B: Queen C: Mary D: the Queen Mary

DGwb A: Bw B: bw C: an D: gn

谁被称作The Virgin Queen A: Queen Elizabeth I B: Queen Victoria

Queen Elizabeth never married all her life, regarded as a ( ) married her nation. A: virgin queen B: lonely queen C: old queen D: good queen

一次小鼠灌胃的体积范围是() A: 0.1~0.25mL/(10g·BW) B: 0.1~0.5mL/(10g·BW) C: 0.1~0.4mL/(10g·BW) D: 0.2~0.5mL/(10g·BW) E: 0.2~1.0mL/(10g·BW)

Which of the following is often known as the Virgin Queen? A: Queen<br/>Anne B: Queen<br/>Elizabeth I C: Queen<br/>Mary I D: Queen<br/>Mary II