【判断题】当呼吸频率增加一倍,潮气量减少一半时,肺通气量与肺泡通气量都不变。
【简答题】与化学药物相比较, 简述 中药的特点有哪些。
【单选题】条形码技术主要有准确度高、制作容易、( )等优点。
【单选题】Listen carefully and decide which of the four suggested answers marked A, B, C and D is the closest in meaning. News summary 4.mp3:
A.
Astronauts have detected the light from a star born 13 billion years ago.
B.
A Nature article claimed that the universe was born about 30 billion years ago.
C.
NASA scientists detected the light from the universe’s first stars.
D.
The stars were created along with the universe itself.