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【单选题】
The writer admires Mrs. Phillips because _______.
A.
she was an excellent cook
B.
she was in command of all the servants
C.
she could keep secrets
D.
she knew everything that went on
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【简答题】In the author’s opinion, the speaker ________. A) gave a correct judgment of the English level of the students B) had exaggerated the language problems of the students C) was right in saying that Engl...
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A.
正确
B.
错误
【单选题】喷管中空气流的速度为300m/s,温度为300K,若要进一步加速,喷管面积应( )。
A.
加大
B.
不变
C.
减小
D.
按拉伐尔喷管结构,先收缩再扩大。
【多选题】画水粉画我们通常会选用
A.
铜版纸
B.
水粉纸
C.
吹塑纸
D.
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【单选题】摩擦与磨损最小的摩擦状态是( ),摩擦与磨损最大的摩擦状态是( ) 。 A. 干摩擦 B. 边界摩擦 C. 混合摩擦 D. 液体摩擦
A.
AB
B.
BC
C.
DA
D.
BD
【单选题】摩擦与磨损最小的摩擦状态是 。
A.
液体摩擦
B.
干摩擦
C.
混合摩擦
D.
边界摩擦
【单选题】The passage suggests which of the following about most existing maps of Native American lands?
A.
They do not record the migrations of Native American tribes.
B.
They have been preserved primarily because of their connection with treaties involving land transfers.
C.
They tend to reflect archaeological evidence that has become outdated.
D.
They tend to be less accurate when they are based on oral reports than when they are based on written documents.
E.
They are not based primarily on the mapmakers’ firsthand oberservations of Native American lands.
【单选题】摩擦与磨损最小的摩擦状态是 摩擦。
A.
混合
B.
液体
C.
边界
D.
【单选题】摩擦与磨损最小的摩擦状态是 。
A.
干摩擦
B.
边界摩擦
C.
混合摩擦
D.
流体摩擦
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