关于相对论的论证目前能过做出来的有哪些()?
A、谱线的重力红移
B、水星近日点的进动
C、光线的重力偏移和雷达回波延缓
D、以上都是
参考答案:D
根据句意及汉语提示写单词,完成句子。
1. We have music on _____(星期二).
2. I don't like math _____(因为)it's not interesting.
3. The girls are often _____(疲倦的)after P.E.class.
4. He thinks English is very _____(困难的).
5. Are your parents _____(忙碌的)these days?
生物碱的碱性强则其()
A.Ka大
B.pka大
C.pka小
D.Kb小
E.以上均非