以下哪项不属于引起低血容量性休克的出血性原因（）
A.胃肠道出血
B.糖尿病、利尿剂过量
C.创伤手术出血
D.动脉瘤破裂出血
参考答案：B
The first edition ________ in 1955 and ________ a best seller ever since. [ ]
A. was published; had been
B. was published; has been
C. has been published; has been;
D. had been published; had
出口不免税是指对国家限制或禁止出口的某些货物的出口环节视同内销环节，照常征税；出口不退税是指对这些货物出口不返还出口前其所负担的税款。下列各项适用出口不免税也不退税政策的有（）。
A.来料加工复出口的货物
B.天然牛黄
C.外贸企业收购货物出口
D.铜及铜基合金
