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【多选题】
巯嘌呤具有以下哪些性质 ( )A.
为二氢叶酸还原酶抑制剂
B.
结构与次黄嘌呤类似
C.
可阻止次黄嘌呤核苷酸转变为腺苷酸和黄嘌呤核苷酸
D.
为抗代谢抗肿瘤药
E.
为烷化剂抗肿瘤药
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皮皮学刷刷变学霸
举一反三
【简答题】In the story The Old Man and the Sea, Ernest Hemingway portrayed an old fisherman named ______, who is triumphant even in defeat.
【简答题】9. The old fisherman is sy-seven years old
and lives _________ his own. A. with B. at C. by D. onA.B.C.D. D
【单选题】________________ is Hemingway’s masterpiece, which is about the old fisherman Santiago and his losing battle with a giant marlin.
A.
A Farewell to Arms
B.
For whom the Bell Tolls
C.
The Sun Also Rises
D.
The Old Man and The Sea
【简答题】光电专业的学生接触的实训材料或是器件设备中有哪些需要执行ROHS认证?列举10种,并举出其使用的有可能是哪种有害物质?
【单选题】The old fisherman is seventy-seven years old and lives _________ his own.
A.
with
B.
at
C.
by
D.
on
【单选题】The old fisherman is seventy-seven years old nd lives _____ his own.
A.
with
B.
at
C.
by
D.
on
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