【单选题】
已知箱盖重力和上方两根绳子拉力Tl和T2组成一平面汇交力系,其中重力G = 200N,T1、T2与竖直方向夹角分别为60°,30°,求Tl、T2 ()
A、Tl=50N T2 = 100N
B、Tl=80N T2 = 120N
C、Tl=100N T2 = 173N
D、Tl=150N T2 = 185N
A、Tl=50N T2 = 100N
B、Tl=80N T2 = 120N
C、Tl=100N T2 = 173N
D、Tl=150N T2 = 185N