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【单选题】
钢中的超声纵波速度为5900m/s，横波速度为3200m/s，有机玻璃中的纵波速度为2730m/s，横波速度为1460m/s，纵波从有机玻璃中入射到钢中的第一临界角为：A.
27.6°
B.
58.6°
C.
14.3°
D.
27.1°
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反馈参考答案：
举一反三
【单选题】What is Paul Lee ’ s purpose in writing this letter ?
A.
To ask about a possible discount for a large purchase and LAN equipment.
B.
To tell Mr. Zhang his satisfaction with their ThinkPad SL series.
C.
To inform Mr. Zhang that their company is going to build a LAN.
D.
To tell Mr. Zhang that they cannot afford its ThinkPad SL series.
【单选题】According to the email , what is NOT true about Mr. Zhang and Paul Lee?
A.
They have met each other face to face.
B.
They have talked with each other on the phone.
C.
They have discussed about ThinkPad SL notebooks.
D.
They have signed a contract for the sale of ThinkPad SL series.
【单选题】According to the letter , what is NOT true about Mr. Zhang and Paul Lee?
A.
They have met each other face to face.
B.
They have talked with each other on the phone.
C.
They have discussed about ThinkPad SL notebooks.
D.
They have signed a contract for the sale of ThinkPad SL series.
【简答题】Paul Lee is arranged to meet the ____ 1 ____ manager of Lenovo Company tomorrow morning, for the manager is ____ 2 ______ at the moment.
【简答题】Paul Lee, the ____ 1 _____ manager from Tormarch Company, calls to learn about the _____ 2 _____ ____ 3 ____ of Lenovo Company.
【单选题】What is Paul Lee ’ s purpose in writing this email ?
A.
To ask about a possible discount for a large purchase and LAN equipment.
B.
To tell Mr. Zhang his satisfaction with their ThinkPad SL series.
C.
To inform Mr. Zhang that their company is going to build a LAN.
D.
To tell Mr. Zhang that they cannot afford its ThinkPad SL series.
【简答题】This is Paul Lee, purchasing manager from Tormarch Company.
【简答题】用来表现所有物品价值的媒介品,称之为 _ _ 。
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