按数量计算胆固醇在体内代谢的主要去路是转变成
A．胆汁酸
B．类固醇
C．二氢胆固醇
D．维生素D3
E．类固醇激素
参考答案：A
Mary is sure to find us easily, for she has a very good sense of____.[ ]
A.direction
B. humor
C. feeling
D. memory
简述闭合性多根多处肋骨骨折的治疗原则。
