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【单选题】
心脏自律细胞产生自律性的基础是A.
0期快速去极化
B.
0期慢速去极化
C.
复极缓慢
D.
无2期
E.
4期自动去极化
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举一反三
【单选题】In spite of rising concern in the Northeast and Canada, Administration spokesmen have repeatedly insisted that nothing could really be done about acid rain and the industry-produced sulfur emissions u...
A.
the Administration has ignored the public anxiety about acid rain.
B.
the industrial sulfur emissions need further scientific verification.
C.
the spokesmen have denied the presence of proofs of acid rain.
D.
scientific evidence has made the cause of acid rain undebatable.
【单选题】The word undergo in Paragraph 1 is closest in meaning to______.
A.
request
B.
experience
C.
repeat
D.
include
【简答题】麻子仁丸证可见:
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