下列指令中()是深孔钻循环指令(FANUC系统)。
A、G71
B、G72
C、G73
D、G74
参考答案:D
“两高一优一低”农业是指高产、高效、优质和()农业。
I enjoy ________ because I can have a lot of _________. [ ]
A. playing the guitar; fun
B. to play guitar; funs
C. playing guitar; fun
D. playing guitar; funs