He reached the station _____ only _____ that the train had just left.
A. tired;learned
B. tiring;learning
C. to tire;to learn
D. tired;to learn
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--- Did that book give the information you needed? --- Yes, but ______, we had to read it almost entirely.
A. for finding it
B. to find it
C. finding it
D. by finding it
图示结构中有( )个固定铰链约束?
A. 4
B. 3
C. 2
D. 1
CT设备采样系统的关键部件是( )
A. 计算机
B. A/D转换器
C. 探测器
D. 图像显示器
E. 多幅照相机