分别画出单大马士革和双大马士革工艺流程图。
参考答案：
房室瓣开放见于
A．心室收缩期初
B．等容收缩期末
C．等容舒张期初
D．等容舒张期末
There ________ two football matches this evening .
A．will have
B．is going to be
C．are going to
D．will be
