铜代谢障碍可引起（）
A.小舞蹈病
B.肝豆状核变性
C.帕金森病
D.迟发性运动障碍
E.亨廷顿病
参考答案：B
In the face of difficulties and drawbacks, we should learn to comfort ourselves and _______our high spirits all the time.
A．keep up
B．go up
C．pick up
D．hold up
为什么含碳1.2%的钢比含碳0.8%的钢硬度高？强度低？
