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【简答题】
已知25℃时，醋酸的Kaθ=1．8×10-5，计算： (1)0．10 mol.L-1 HAc溶液的c(H+)、pH、电离度α各为多少? (2)在1．00 L上述溶液中加入0．20 mol固体NaAc后(忽略体积变化)，溶液的c(H+)、pH、解离度α分别变为多少?
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举一反三
【单选题】Animal and plant cells are typically 5 to 100 μm in diameter, and many unicellular microorganisms are only 1 to 2 μm long.Assume a plant cell is a cylinder (diameter 48.0 μm, height 85.0 μm), with a d...
A.
23.0 ng
B.
33.0 ng
C.
43.0 ng
D.
53.0 ng
【单选题】Animal and plant cells are typically 5 to 100 μm in diameter, and many unicellular microorganisms are only 1 to 2 μm long. Assume a human hepatocyte is a cylinder (diameter 14.0 μm, height 15.0 μm), w...
A.
1.2 ng
B.
2.0 ng
C.
2.4 ng
D.
3.4 ng
【简答题】曲轴位置传感器用来检测活塞上止点及曲轴转角的信号并将其输入发动机ECU,用来对( )和( )进行控制。
【单选题】Plant cells are usually 10 to 100 μm in diameter—larger than animal cells, which typically range from 5 to 30 μm. Assume a human hepatocyte is a cuboid (length 13.0 μm, width 10.0 μm, height 17.5 μm),...
A.
1.2 ng
B.
1.8 ng
C.
2.4 ng
D.
2.8 ng
【单选题】Animal and plant cells are typically ______ μm in diameter.
A.
5-10
B.
5-15
C.
5-20
D.
5-50
【单选题】Plant cells are usually 10 to 100 μm in diameter—larger than animal cells, which typically range from 5 to 30 μm. Assume a human hepatocyte is an oval (a 6.5 μm, b 7 μm, c 12 μm, radius), with a densi...
A.
2.2 ng
B.
2.4 ng
C.
2.8 ng
D.
3.0 ng
【单选题】检测发动机曲轴转角和活塞上止点,并将检测信号及时送至发动机ECU,用以控制点火时刻和喷油正时的传感器是
A.
曲轴位置传感器
B.
转速传感器
C.
霍尔传感器
D.
空气流量传感器
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