采用刺激迷走神经的方法可以纠正的心律失常是()
A．心房扑动
B．心房颤动
C．窦性心律不齐
D．阵发性室上性心动过速
E．阵发性室性心动过速
参考答案：D
We ______ any cars. They ______ cars, either. [ ]
A. have no; don't have
B. don't have; have no
C. aren't have; are have
D. have not; aren't have
某二叉树中度为2的结点有10个，则该二叉树中有( )个叶子结点。
A．9
B．10
C．11
D．12
