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Ozone is found not only naturally in the atmosphere but it is also used as a strong oxidizing agent in water treatment. One way to measure the ozone concentration in water is through its absorption of ultraviolet light. A solution dissolved ozone in water gives a percent transmittance of 90% when measured at 258 nm and using a sample holder that has a path length of 4.00 cm. The molar absorptivity of ozone at 258 nm is known to be 2950 L/ molNaN. a) What is the absorbance of this sample, and what is the concentration of ozone in the sample? b) If no other absorbing species are present in the sample, what concentration of ozone would be expected to give and absorbance of 0.100 under these conditions?
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【简答题】vi. 被撕裂,裂开_____
【单选题】There three new films in the cinema next month. [ ]
A.
are going to be
B.
is going to be
C.
are
D.
is
【简答题】地陪小何带领一个欧洲旅游团参观了某工艺厂。在返回酒店的途中，客人奥巴马对小陈说，刚才在工艺厂看到一件工艺品他很喜欢，想买下送给他太太作为生日礼物，因为当时考虑价格太贵没有买下，现在想想还是要买。他问小陈能否回到饭店后与他一起乘出租车再去趟工艺厂。小陈认为那时工艺厂可能已经下班了，不如现在马上就去，说完就让司机掉转车头赶回工艺厂。在工艺厂里奥巴马以600欧元买下那件工艺品，可是当售货员在帮他包装时，...
【简答题】砂土的抗剪强度线是一条通过坐标原点 （直线、斜线）
【单选题】听力原文：M: Is your brother still in New Zealand?F: No. He went there three years ago. When was the woman's brother in New Zealand?
A.
Three years ago.
B.
Two years ago.
C.
Ten years ago.
【单选题】In fact he knows this place very well, for he ________ there three times.
A.
has been
B.
has been to
C.
has gone
D.
has gone to
【单选题】I know Beijing very well since I ________ there three times.
A.
have been
B.
went
C.
have gone
【单选题】—Have you ever been to Singapore? —Yes, I ________ there three times in 2009 alone.
A.
have been
B.
have gone
C.
went
D.
had gone
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