_____ a basketball? [ ]
A. Do you have
B. Are you have
C. Are you
D. Do you are have
答案:A
拟定从甲地到乙地通话m分钟的电话费由f(x)=1.06×(0.50×[m]+1)给出,其中m>0,[m]是大于或等于m的最小整数,若通话费为10.6元,则通话时间m∈______.
焊接可分为电弧熔焊、压力焊和钎焊三类。