对动叶可调的轴流式风机,为避免启动电流过大,应()启动。
A、关闭动叶片
B、全开动叶片
C、半开动叶片
D、将动叶片调到效率最高的角度时
参考答案:B
在心理学上,一般将教师的期望的预言效应称之为()。
A.罗森塔尔效应
B.霍桑效应
C.晕轮效应
D.冯雷斯托夫效应
E.约翰亨利效应
Joan had a total of $16.50 in her coin bank. How many quarters does she have (1) The bank contains only quarters and dimes. (2) There were 81 coins in the bank.