潜水员从深水中快速升到水面易发生（）
A.肿瘤细胞栓塞
B.氮气栓塞
C.脂肪栓塞
D.空气栓塞
E.血栓栓塞
参考答案：B
Of 40 applicants for a job, 32 had at least 5 years of prior work experience, 24 had advanced degrees, and i6 had at least 5 years of prior work experience and advanced degrees. How many of the applicants had neither 5 years of prior work experience nor advanced degrees ？（）
A. 0
B. 2
C. 4
D. 8
E. 16
人工清淤的次数一般为一年（）。
A、3～4次
B、2～3次
C、1～2次
D、根据需要随时安排
