喉痉挛的处理措施包括（）
A.解除诱因
B.面罩吸氧
C.加深麻醉
D.使用肌松剂
E.表面麻醉
参考答案：A, B, C, D
哪些情况下紧急停止故障给水泵？
Our teacher always speaks slowly and clearly in class _____.
A．so as to be understood
B．to have understood
C．so as to understand
D．to understand
