【单选题】
A $rosruncamera_calibrationcameracalibrator.py--size(X)x(Y)--square(a)image:=/usb_cam/image_rawcamera:=/usb_cam
B http://wiki.ros.org/camera_calibration/Tutorials/MonocularCalibration?action=AttachFile&do=view&target=check-108.pdf
C $rosdepinstallcamera_calibration
D $roslaunchusb_camusb_cam-test.launch
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