单项选择题

心交感神经心肌效应的主要机制是: ( )

A．明显增加Ca2+通透性
B．减弱自律细胞4期的内向电流If
C．使复极相K+外流减慢
D．增加肌钙蛋白的Ca2+亲和力
E．不应期延长

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多项选择题

计算带息商业汇票到期值时，应考虑的因素有（）。
A、票面利率
B、票面金额
C、票面期限
D、贴现率
E、贴现期限

单项选择题

The________ is a derivative forward contract that was created in the1990s. It has the same characteristics and documentation requirementsas traditional forward contracts except that they are only settled in
A、nondeliverable forward
B、dollar only forward
C、virtual forward
D、internet forward