照明能量指标(W/㎡)与多种因素有关，但( )不属于此范围。
A. 光源的光效
B. 灯具的效率
C. 供电线路导线损耗
D. 镇流器损耗
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There was nothing they could do（）
A. but wait
B. except waiting
C. only to wait
D. unless they waited
光源色温小于3300K时其色表特征为( )。
A. 暖
B. 冷
C. 中间
D. 较冷
账务处理系统中，已经登入账簿中的数据( )。
A. 不可以修改或删除
B. 可以删除
C. 可以增加
D. 可以修改
According to the context, "a mixed blessing" ( Para. 1 ) most probably means ______.
A. living longer and losing more
B. living shorter and getting more
C. having a long life and making great contributions
D. achieving success both in young age and in old age
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