二乙氨基二硫代甲酸银分光光度法测定空气中砷,因颗粒物难以分解造成分析结果偏低时,可将采样后的滤膜先用硫酸-硝酸—高氯酸消解,然后再进行分析测定。
参考答案:对
—What do you like to do after dinner?
—I like to ____ my friends. It’s really relaxing.
A.begin with
B.agree with
C.hang out with
D.make friends with
膨胀阀与毛细管在控制制冷剂流量时,都能够根据需求自动调节。