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【单选题】
机器人速度单位是 。A.
cm/min
B.
in/min
C.
in/sec
D.
mm/sec
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】He caught the train with a few minutes _______.
A.
spared
B.
sparing
C.
to spare
D.
spare
【简答题】He not only spared no efforts to study, but also help classmates around him to learn. Not only ____ he spare no efforts to study, but also help classmates around him to learn.
【多选题】下列关于反射波法激振设备的说法中，哪些是正确的？（）
A.
相对于手锤，力棒的信号重复性好
B.
锤头材料或锤垫厚度均影响敲击脉冲宽度
C.
敲击时，手锤的手柄不宜过长
D.
铝、尼龙和硬橡胶三种材料的锤头，脉冲力持续时间铝头最长
【单选题】_________ to his research, he spared no time to spend a weekend with us. [ ]
A.
Devoting
B.
Caught
C.
Devoted
D.
Lost
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