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举一反三
【单选题】The shape of a F-distribution is:
A.
positively skewed.
B.
symmetric.
C.
negatively skewed.
D.
uniform.
【单选题】测 100mL 自来水的硬度,消耗 12.50mL 的 0.01000mol/LEDTA ,水硬度用 CaCO 3 表示 ,其水硬度为( )
A.
25
B.
250
C.
12.5
D.
125
【单选题】测100 mL自来水的硬度,消耗12.50 mL 的0.01000 mol/L EDTA,水硬度用 CaCO 3 表示 ,其水硬度为:
A.
250
B.
100
C.
125
D.
300
【单选题】测 100 mL 自来水的硬度,消耗 12.50 mL 的 0.01000 mol/L EDTA ,水硬度用 CaCO 3 表示 ,其水硬度为:
A.
250
B.
100
C.
100
D.
125
【单选题】实验中测定自来水总硬度时,消耗的 EDTA 的体积为 V1 ,测定同体积水样中 Ca 2+ 含量时,消耗的 EDTA 的体积为 V2 ,则水样中 Mg 2+ 消耗的 EDTA 的体积为( )。
A.
V1-V2
B.
V1+V2
C.
V1-V2/2
D.
V1/2-V2
【单选题】When being towed，a fairlead is a ().
A.
Fabricated shape used to change the direction of a flexible member of the tow hookup
B.
Fabricated shape used to secure the tow hookup to the towed vessel
C.
Line connecting the fishplate to the bridle legs
D.
Line connecting the tow bridle to the towed vessel
【单选题】The shape of CH3F is best described as
A.
linear
B.
planar
C.
pyramidal
D.
tetrahedral
E.
octahedral
【单选题】Films could be taken all the year round in Hollywood because ______.
A.
of tile fine weather and varied scenery (景色) there
B.
there were snow-capped mountains and the sea
C.
oil was discovered in California
D.
it was in the suburbs
相关题目：
【单选题】测100 mL自来水的硬度,消耗12.50 mL 的0.01000 mol/L EDTA,水硬度用 CaCO 3 表示 ,其水硬度为:
A.
250
B.
100
C.
125
D.
300
参考解析：
知识点：
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