【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】样板是服装企业批量生产必不可少的标样和模板,是生产中的主要依据,在生产中用于排料,划样、裁剪所用的样板俗称()。
【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.