轿厢安全门不得向轿厢()开启。
A.内
B.外
C.无所谓
参考答案:B
在显微镜的结构中,能调节视野亮度的是( )
A.目镜和物镜
B.载物台和镜筒
C.镜筒和转换器
D.遮光器和反光镜
If I had__________ , I’d visit Europe, stopping at all the small interesting places.
A. a logn enough holiday B an enough long holiday
C. a holiday enough long D. a long holiday enough