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【单选题】
轴心轨迹在故障诊断中可用来确定转子的临界转速、空间振型曲线及部分故障，如不对中、摩擦、油膜振荡等，只有在 的情况下可能发生油膜振荡。A 负进动 B 正进动C 旋转方向 D 涡动方向A.
负进动
B.
正进动
C.
旋转方向
D.
涡动方向
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【简答题】（3）完形填空 Older people must be given more chances to learn if they are to contribute to society rather than be a financial burden, according to a new study on population published recently. The current ...
【单选题】听力原文：W: What do you want me to get? I'm leaving now. M: Pick up a bottle of milk and a loaf of bread please. Q: Where is the man probably going? (17)
A.
To the bank.
B.
To bookstore.
C.
To a shoe store.
D.
To the grocer' s.
【单选题】I think the older people must be ______ politely. [ ]
A.
talked about
B.
said with
C.
told about
D.
spoken to
【单选题】--- I think the older people must be _______ politely. ---Yes. You are so kind.
A.
talking about
B.
said with
C.
tell about
D.
spoken to
【简答题】Accrding______a Chinese custom,families must take care the older people.
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