题目内容

要查看曾经浏览过的网页，可通过（）

A. 收藏夹
B. 地址栏
C. 历史记录
D. “前进”和“后退”按钮

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请仔细听下面一段文字，根据听到的内容补全空格中缺失的单词。I'm Wang Hong, a tour guide at Discovering China.I've been working as a tour guide for more than 10 years. My father was __20_, too.I learned a lot from him.I _21_ being a tour guide. I've _22_ to many places in China and abroad in the past 10 years. Every day is a challenge for me, working with different people, but it is _23_ and rewarding. I love working with people from different places. China has rich tourism resources and I am still _24___ to explore its wonderful natural scenery.

天体高度是_____在天体垂直圈所夹的一段弧长。

A. 测者真地平圈和春分点
B. 格林午圈和天体中心
C. 天体方位海区测者天顶
D. 测者真地平圈和天体中心
E. 1

某天体的春分点格林时角为 122°,共轭赤经为 252°,测者经度为 046°W,则该天体的地方时角为( )

A. 32°E
B. 32°W
C. 60°E
D. 48°W
E. 多余

组氨酸标签-Ni亲和层析的洗脱过程中,在流动相中加入咪唑的洗脱方法称作 ( )

A. 阴性洗脱
B. 剧烈洗脱
C. 竞争洗脱
D. 非竞争洗脱