增殖型天疱疮是以下哪种类型天疱疮的良性型（）
A.红斑型天疱疮
B.大疱性类天疱疮
C.落叶型天疱疮
D.寻常型天疱疮
E.疱疹样型天疱疮
参考答案：D
In relation to representation:
(a) Define what is meant by a contract of commission and explain the rights and obligations created by a contract of commission. (7 marks)
非奥氏体不锈钢异种钢焊接时，焊条的选用应介于两者之间或按合金含量（）的一侧相配。
A.高
B.低
C.无特殊规定
D.高或低
