《照片档案管理规定》保存底片的适宜温度(),相对温度(),保存照片的适宜温度(),相对温度()
参考答案:13-15%,35-45%,14-24℃,40-60﹪
You can hardly imagine the ______ they went ______.
A.suffering; through
B.concern; through
C.recovery; over
D.worry; over
氯气的化学性质非常活泼,在一定条件下能与下列哪些物质发生反应?()①NH3②苯③H2O④乙烯
A.①②
B.②④
C.②③④
D.①②③④