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【判断题】
自由度数是指相平衡系统中可独立改变而不引起的变量数。A.
正确
B.
错误
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参考解析：
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【单选题】工作场所的职业病危害因素可分为物理因素、化学因素和生物因素。下列危害因素，不属于作业场所物理性职业病危害因素的是( )。
A.
由气体排放产生的噪声
B.
生产过程释放的有毒物质
C.
炉前工接触的红外线
D.
电焊时产生的电弧光
【单选题】工作场所的职业病危害因素可分为物理因素、化学因素和生物因素。下列危害因素，不属于作业场所物理性职业病危害因索的是( )。
A.
由气体排放产生的噪音
B.
生产过程释放的有毒物质
C.
炉前工接触的红外线
D.
电焊时产生的电弧光
【单选题】听力原文：M: Who do you work for at the moment, Ms Mann? W: Um, I work for the BBC World Service. M: Ah, and how long have you worked for the BBC? W: I've been with the BBC for five years. Yes, exactly fiv...
A.
She has been working for the BBC for five years and working as their German correspondent for two years.
B.
She has been working for the BBC for two years and working as their German correspondent for eleven months.
C.
She bas been working for the BBC for four years and working as their German correspondent for one year.
D.
She has been working for the BBC from eleven years ago and working as their German correspondent for five years.
【单选题】听力原文：W: I saw you riding your bike to work today. You usually drive to work, I remember. What's the matter now? M: I did until the prices on gas jumped high. Q: What do we learn from the conversation?...
A.
The man always rides a bicycle.
B.
The man used to drive to work.
C.
The woman wants to borrow the man's bike.
D.
The woman is asking for a lift.
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