轴承温度计的指针，随温度变化而偏转，当转到所整定的数值时，两对触点接通而发出警报。（）
参考答案：对
商业性开发以( )为出发点。
A．私人利益
B．公共利益
C．集体利益
D．他人利益
How much time do you often spend _________ English every day?
A．to practice speaking
B．practicing to speak
C．on practicing to speak
D．practicing speaking
