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【单选题】
The duration of effective refractory period of ventricular cell mainly depends on：A.
amplitude of phase 0 depolarization
B.
level of threshold potential
C.
duration of phase 2 (plateau)
D.
function of Na+ -K+ pump
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【单选题】You'd better not take his remarks too seriously, which apparently were______.
A.
simultaneous
B.
substantial
C.
spontaneous
D.
sporadic
【单选题】You should always apologise if you ______ somebody.
A.
talk to
B.
speak to
C.
interrupt
D.
complain
【单选题】You should always apologise if you _______ somebody.
A.
talk to
B.
speak to
C.
complain to
D.
interrupt
【简答题】while循环用于多次迭代程序的一部分。条件为_____时一直循环执行代码块。
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