突发性灾难的现场特点不包括（）
A.紧迫性
B.危险性
C.复杂性
D.突发性
E.自助性
参考答案：E
Some of the exercises appear to be ____ ones that you have done, but after taking ___ second look,
you will find that they are different. [ ]
A.不填; the
B. the; a
C. the; the
D. the; 不填
转子流量计特别适宜于管道直径小于（）。
A、80mm
B、50mm
C、40mm
D、25mm
