下面不属于钢结构常见的破坏形式的是（）。
A.构件折损
B.裂纹与开焊
C.结构变形
D.螺栓松动
参考答案：D
治疗肝气郁结型经行 * * 胀痛呈肝郁化热之象的首选方剂是（）
A.逍遥散
B.柴胡疏肝散
C.血府逐瘀汤
D.滋水清肝饮
E.丹栀逍遥散
Tom and Mike are good friends. They often each other from being punished by the teacher.
A．prevent
B．settle
C．shelter
D．prefer
