根据《中华人民共和国职业病防治法》，高温、辐射、噪声等职业性危害因素属于（）。
A.生物因素
B.化学因素
C.物理因素
D.劳动心理因素
参考答案：C
In order to improve English _____.
A．Jenny’s father bought her a lot of tapes
B．Jenny bought a lot of tapes for herself
C．a lot of tapes were bought by Jenny
D．a lot of tapes were bought by Jenny’s father
变送器的定期维护包括哪些工作？
