土方路堑的开挖根据路堑深度和纵向长度开挖方式可分为横挖法、（）、混合开挖法。
参考答案：纵挖法
非控制呼吸麻醉中对呼吸的观察，下列哪项最重要（）
A.潮气量
B.呼吸幅度
C.呼吸频率和幅度
D.呼吸频率
E.以上都不重要
An analyst does research about options. A series of interest rate call options expiring on different dates but having the same exercise rate is best characterized as a(n):
A. zero-cost collar.B. interest rate cap.C. interest rate floor.
