有关DNA的叙述,不正确的是( )
A.DNA的分子结构呈螺旋状
B.DNA和蛋白质组成染色体
C.DNA就是染色体
D.DNA分子上含有基因
答案:C
列车在运行过程中,出现TOD死机(速度曲线和提示信息无变化,且TOD生命图标停止转动)、黑屏或花屏且无法辨认车载信号时,该如何处理?
—Why do English people talk so often about the weather when they start a conversation?
—Well, it’s probably because the weather is a(n)________ topic.
A.safe
B.sensitive
C.amazing
D.ordinary