（）是小组动力的关键。
A.小组凝聚力
B.小组感染力
C.小组安全感
D.小组自助、互助
参考答案：A
解析：小组凝聚力是小组动力的关键。
— How are you getting on with your study?
— _____, I haven't made _____ I expected. [ ]
A. Well, as much progress as
B. Oh, so much progress as
C. What, as many progress as
D. Yes, so more progress as
红外热像检测应根据被测设备的材料设置辐射率，作为一般检测，被测设备的辐射率一般取（）%左右。
A.0.8
B.0.85
C.0.9
D.1.0
