什么是平行试验?
参考答案:
同一操作者在同一实验室里,用同一台设备按试验方法规定的步骤同时完成同一试样的两个或多个的测定过程。平行试验是重复试验的特殊情况。
根据句意和汉语提示,填写单词。
1. An old woman won five _____ (百万) yuan in the lottery ( * * 抽奖).
2. You look unhappy today. Please tell me your _____ (烦恼的事情).
3. His father was wearing a white shirt and a red ________(领带).
4. The book was the result of ten years of medical _____ (研究).
5. The famous singer gave much money to _____ (慈善事业) to help homeless children.
异步电动机的极数越少,则转速越高,输出转矩()。
A、增大
B、不变
C、越小
D、与转速无关