声波是在()中传播的弹性纵波,传播速度为340m/s。
A.空气
B.介质
C.表层
参考答案:A
根据句意及所给的汉语提示,填写适当单词完成句子。
1. She likes _____(蔬菜) because they are good for her.
2. She has _____(午饭) at school every day.
3. I'm very _____(疲劳的) after the long walk.
4. She _____(通常) swims after school.
5. She has a dancing lesson on _____(周三).
NJ07型列车司机室激活状态下,CTS转至“被救援“位,再将主控钥匙关断,会导致()。