正确存放照相机的方法：放于阴凉、干燥、通风的地方。
参考答案：对
________ has finished the work ahead of time will be rewarded with a onemonth holiday. [ ]
A. Those who
B. Anyone
C. Whoever
D. No matter who
SPM的效果与输入信号的光强成正比，与光纤衰减系数及有效纤芯面积成反比。（）
