∵y=sinα•cosα=12sin2α
∴T=2π2=π
故选B.
From his ________ voice on the phone I know everything is going under way.
A.satisfactory
B.satisfying
C.satisfied
D.satisfaction
请回答箭头所指部位(彩图)的解剖名称()
A.脾静脉
B.脾动脉
C.胃左动脉
D.左肾动脉