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【单选题】
细胞外Ca2+浓度降低对心肌生理特性的影响,以下哪错误的?A.
快反应细胞阈电位下移,兴奋性升高
B.
细胞膜对Na+内流的抑制作用减弱
C.
0期去极速度增快
D.
0期去极幅度增高
E.
4期自动去极速度减慢,自律性降低
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皮皮学刷刷变学霸
举一反三
【单选题】Please Listen to the following TED talk and answer the questions followed. (1分11秒-55秒) What happened when the speaker just built the instrument with his team to propose an experiment to fly to Venus?
A.
He just joined NASA
B.
He became involved in calculations of the greenhouse effect on earth and found that our atmospheric composition was changing
C.
He has just resigned as principal investigator on the Venus experiment
D.
He was continuing his experiment on the trip to Venus
【简答题】He raised his glasses to propose a ___ to the newlywed.
【简答题】How did the baby get his name? How did Mr. and Mrs. Owens and Silas propose to raise him?
【简答题】I’d like to propose a toast to Mr. Black on his sieth birthday.
【单选题】( )是指居住国政府行使居民税收管辖权时,通过允许纳税人以在国外缴纳的税款冲抵本国汇总国内外所得按本国税率所计征的税额的方法。
A.
免税法
B.
扣除法
C.
低税法
D.
抵免法
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