子宫内膜异位症用性激素治疗主要作用是
A．调节月经周期B．减轻痛经程度C．精神安慰D．抑制排卵E．促进排卵
参考答案：D
带传动是利用传动带与带轮之间的张紧力来传递运动和动力的。
The port of registry is（）.
A.not required to be marked anywhere on the vessel
B.required to be marked on both bows and on the keel
C.required to be marked on the stern with the name of the vessel marked on both bows
D.required to be marked on the keel, stern, and both bows
