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【单选题】
Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. 听力原文：W: I hear you're working as a market surveyor this summer. It's got to be awfully difficult asking the same old questions every day. M: Well, it is challenging work, but I get to meet lots of new people and the pay is decent enough. Q: What does the man think of his new job? (12)A.
The job is not rewarding but challenging.
B.
The job is both challenging and rewarding.
C.
The job has both its strength and weakness.
D.
The job is hard work and the pay is not satisfactory.
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【简答题】刚体在同一平面内受力偶矩M和作用线不过A点的力F作用。已知力系满足 =0,则刚体能否平衡?________ (填是或否)
【简答题】轴AB上作用一主动力偶，矩为M 1 ，齿轮的啮合半径R 2 ＝2R 1 ，如图4-5所示。问当研究轴CD的平衡时：(1)能否以力偶矩矢是自由矢量为由，将作用在轴AB上的力偶搬移到轴CD上?(2)若在轴CD上作用矩为M 2 的力偶，使两轴平衡，问两力偶的矩的大小是否相等?转向是否应相反?
【多选题】一刚体只有两力 F A 、 F B 作用,且 F A + F B = 0(即两力大小相等方向相反,但不一定共线) ,则此刚体( ); 一刚体上只有两力偶 M A 、 M B 作用, M A + M B = 0 ,则此刚体( )。
A.
一定平衡;
B.
一定不平衡;
C.
平衡与否不能判定。
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