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
Lei Feng was a soldier who _____ the people and Chairman Mao used to speak highly of him. [ ]
A. devoted himself to serve
B. devoted himself to serving
C. was devoted to serve
D. devoted himself in serving
两器高低并列式催化裂化装置的催化剂采用（）密相输送。
A.立管
B.斜管
C.U型管
D.水平管
