【单选题】下列哪种作用是以DNA为靶的化学诱变作用
【单选题】歌曲是由陈玛原先生从潮州民谣整理提炼出来,成为当地民众家喻户晓的潮州方言歌。
【单选题】— Our holiday cost a lot of money. — That doesn't matter _____ you enjoyed yourselves. [ ]
【单选题】餐饮设备、用品能否得到对的使用与保管,一方面直接关系到其使用寿命与餐厅的开支,另一方面可反映出( )。
【单选题】下列哪种作用是以DNA为靶的化学诱变作用
【单选题】What is an advantage of the magnetic compass aboard vessels?
A.
Compass error is negligible at or near the earth's magnetic poles
B.
It does not have to be checked as often
C.
It is reliable due to it's essential simplicity
D.
All points on the compass rose are readily visible.
【单选题】砂的筛分析实验,两次检测,累计筛余百分比平均值精确到多少?