函数y=k(x-k)(k<0)的图象不经过[ ]
A.第一象限
B.第二象限
C.第三象限
D.第四象限
答案:A
Many trees _____ on the hill next year. [ ]
A. is planted
B. plants
C. have planted
D. will be planted
骨显像中常用99mTc-MDP的剂量是()
A.37~74MBq
B.74~185MBq
C.185~370MBq
D.555~1110MBq
E.大于1110MBq