被称作是合成蛋白质“装配机”的是()
A.DNA
B.RNA
C.mRNA
D.tRNA
E.rRNA
参考答案:E
完成句子。
1. John was hoping to work with the new teacher. (同义句转换) John was working
with the new teacher.
2. (你怎样解释) your long absence from classes?
3. Mary (减肥) in the last few months, and she looks more beautiful.
4. Ways must be found to (阻止河流污染).
5. Lily (对…有天赋) learning languages. No wonder she can speak four foreign languages.
当雷达接收机检测出发射脉冲与接收脉冲之间的延迟时间为tR=500?S时,这时目标距雷达站的距离是()。
A.150Km
B.120Km
C.100Km
D.75Km