KQ-150潜孔钻机履带板销孔直径为Φ（）mm。
A.25
B.26
C.27
参考答案：C
Don't forget to ______ "Thank you" when someone has helped you. [ ]
A. speak
B. tell
C. say
D. talk
窦性心动过缓的频率为（）
A.<70／min
B.<60／min
C.50～60／min
D.<50／min
E.<40／min
