监控机发出变压器“备用冷却器投入”信号。下列说法不正确的是()。
A.工作冷却故障
B.至少有一个冷却器在备用工作方式
C.油温升高
D.负荷增大
参考答案:B, C, D
根据句意和首字母提示完成下列句子。
1. They can see many l_____ on the tree in summer.
2. Class begins! Please be q______.
3. A koala usually r_____ ten hours every day.
4. Elephants like to eat g______. Rabbits like it, too.
5. The lion is very l______. He usually sleeps 20 hours every day.
建立劳动关系应当以什么形式订立劳动合同?