热成像仪的特点有：（）。
A.隐蔽性好
B.能发现伪装
C.受天侯影响小
D.观察距离较远
参考答案：A, B, C, D
Classes were over. The students stopped __________. [ ]
A. have a rest
B. had a rest
C. having a rest
D. to have a rest
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