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【简答题】
试述造血干细胞的概念和特征
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】男性，25岁，上腹部突发刀割样剧痛1h急诊入院。查体：强迫体位，板状腹，全腹压痛、反跳痛、肌紧张，以右上腹为著，肝浊音界减小，肠鸣音减弱。下列非手术疗法中不必要的是
A.
禁食、胃肠减压
B.
输液、纠正电解质紊乱
C.
抗生素治疗
D.
针刺治疗
E.
抗胰酶疗法
【多选题】Please point out（ ） are the characteristics of settlement by letters of credit.
A.
L/C is a self- sufficient instrument
B.
L/C is a document transaction
C.
L/C is not a self- sufficient instrument
D.
L/C is a cargo transaction
【单选题】Please point out which of the following expressions is not the characteristics of settlement by letters of credit.( )
A.
L/C is a self-sufficient instrument
B.
L/C is a document transaction
C.
The issuing bank’ s liabilities for payment
D.
L/C is a cargo transaction
【简答题】Please point out（ ）are the characteristics of settlement by letter of credit．
【简答题】Please point out one: or two artistic features of the poem with the examples in the text.
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