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【单选题】
下列形成心室肌细胞动作电位的离子基础，目前认为哪一项是错误的？A.
0期主要是Na+内流
B.
１期主要是K+外流
C.
２期主要是Ca2+内流和K+外流
D.
３期主要是K+外流
E.
４期除Na+－Ca2+交换作用外，没有离子电流
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反馈参考答案：
举一反三
【单选题】关于排卵型功血，下述哪项是错误的：
A.
卵泡期E2、FSH减少，LH峰值不高，排卵后黄体发育不佳，而发生排卵型功血
B.
在青春期性轴发育尚不健全，更年期卵巢功能开始衰退时很少发生排卵型功血
C.
排卵型功血基础体温双相
D.
子宫内膜表现为腺体分泌不足或不规则脱落
E.
性成熟期不会发生排卵型功血
【判断题】College dorms in America usually have common rooms, which are used by students to study or hang out with their friends.
A.
正确
B.
错误
【多选题】Which of the following elements are the primary differences between the U.S.and the U.K.systems of higher education?
A.
length of time
B.
ranking of universities
C.
academic term
D.
university organization
【简答题】n. [U] the length of time that sth. continues 持续时间
【单选题】In the early days of nuclear power, the United States make money on it. But today opponents (反对者 ) have so complicated its development that no nuclear plants have been ordered or built here in 12 year...
A.
he inefficiency of the Nuclear Regulation Commission.
B.
The enormous cost of construction and operation.
C.
The length of time it takes to make investigations.
D.
The objection of the opponents of nuclear power.
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