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【判断题】
将圆周率计算到小数点后40多亿位是没有意义的事情。A.
正确
B.
错误
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举一反三
【单选题】关于碘标准溶液的叙述错误的是( )
A.
由于碘单质挥发性大，因此碘标准溶液不宜用直接法进行配制
B.
标定碘标准溶液常用的基准物是草酸钠
C.
标定碘标准溶液常用的基准物是As2O3
D.
可以用硫代硫酸钠标准溶液标定碘标准溶液
E.
配制碘溶液时应先将碘单质溶解在浓KI溶液中再进行稀释
【多选题】人体血液中的缓冲物质都是由一种弱酸和相应的强碱盐组成，下列正确的是 [ ]
A.
Na 2 CO 3 /NaHCO 3
B.
Na2PO4/NaH2PO 4
C.
NaH 2 PO 4 /Na 2 HPO 4
D.
H 2 CO 3 /NaHCO 3
【单选题】What effect does the imagery produce in this opening passage from George Orwell’s novel 1984? "It was a bright cold day in April, and the clocks were striking thirteen. Winston Smith, his chin nuzzled...
A.
Since the opening line is in April, this passage sets up expectations for Winston Smith to better his situation throughout the spring.
B.
The contradictory details of Winston’s building being named Victory Mansions and it smelling of boiled cabbage and old rag mats creates a feeling of unease in the reader.
C.
The fact that most of these details are unpleasant—the vile wind, the gritty dust, and old rag mats—makes the reader understand that Winston is a pessimistic man.
【简答题】(1)I'm trying to lose weight because I'm so ashamed ___ my shape. (2)I would be ashamed _______ (admit) feeling jealous. (3)He knew well he'd be ashamed of ______ (him) later. (4)It is ___ shame that ...
【单选题】人体血液中的缓冲物质是由一种弱酸和相应的强碱盐组成的，它们对于维持血液pH的相对稳定有着重要作用。下列正确的一项是 ①Na 2 CO 3 /NaHCO 3 ②Na 3 PO 4 /NaH 2 PO 4 ③NaH 2 PO 4 /Na 2 HPO 4 ④H 2 CO 3 /NaHCO 3 [ ]
A.
①②
B.
③④
C.
①③
D.
②④
【单选题】Why does the man think the sun is very important for his life?A.It makes him more active,#
A.
Why does the man think the sun is very important for his life? A.It makes him more active,
B.
It allows him to think better.
C.
It gives him a feeling of comfort.
【简答题】由NaH 2 PO 4 和Na 2 HPO 4 组成缓冲溶液中的缓冲对物质是（）。该缓冲溶液的缓冲作用的有效范围pH值是（）。
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