用有效数字运算规则进行下列运算:
(1)17.593+0.00458-3.4856+1.68
(2)
(3)已知pH=8.23,求溶液的H+浓度
(4)已知溶液中含有OH-为5.0×10-5mol·L-1,计算溶液pH
第2题
The weight breaks of General Cargo Rates are ()
A.45kg
B.10kg
C.100kg
D.30kg
第3题
A.breaks off
B.breaks down
C.breaks out
D.breaks up
第4题
If the car ________ just once more, I‟m going to get a new one.
A. breaks out
B. breaks off
C. breaks down
D. breaks up
第5题
______ breaks the law is sure to be published.
A.Who
B.Whoever
C.That
D.Which
第6题
______ breaks the law will be punished sooner or later.
A.Who
B.Whoever
C.Someone
D.Anyone
第7题
______ breaks the law will be punished sooner or later.
A.Who
B.Whoever
C.Anyone
D.Someone
第8题
“毛重;净重;公重”,正确的翻译为:( )。
A.gross weight; clean weight; dry weight
B.total weight; clean weight; dry weight
C.gross weight; net weight; conditioned weight
D.total weight; net weight; conditioned weight
第9题
______ breaks the law will be punished sooner or later.
A.Who
B.Someone
C.Anyone
D.Whoever
第10题
It is the last ______ that breaks the camel's back.
A.grass
B.leaf
C.straw
D.dust
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