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【简答题】
根据硫酸、氢氧化钠、硫酸铜和二氧化碳等物质的性质,完成下列填空. (1)稀释浓硫酸时,应把______缓缓注入______的烧杯中. (2)硫酸铜溶液的颜色是______. (3)氢氧化钠露置在空气中会变质,生成含钠的化合物是______. (4)任写出一个氢氧化钠溶液与上述物质能发生反应的化学方程式:______.
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【简答题】 3D.mp3 Listen to the dialogue “Don’t look down upon trifles”and answer the following questions. What kind of business does Bernard’s company do? Why does Jessica advise Bernard not to look down upon...
【单选题】What is its business sector?
A.
Household Appliances
B.
Mobile Phones
C.
Chemical Products
【简答题】Listen to the dialogue “Don’t look down upon trifles”and answer the following questions. What kind of business does Bernard’s company do? Why does Jessica advise Bernard not to look down upon trifles?...
【判断题】A mission describes what an organization actually does, what its business is, and why it does it.
A.
正确
B.
错误
【单选题】用检查棒校正丝杠螺母副同轴度时,为消除检验棒在各支承孔中的安装误差,可将检验棒转过 后再测量一次,取其平均值。
A.
60°
B.
180°
C.
90°
D.
360°
【单选题】给出下面的程序代码， 如何使成员变量a被方法m( )访问（）。 public class X4_1_3 { private float a; public static void m ( ){ } }
A.
将private float a改为protected float a
B.
将private float a改为public float a
C.
将private float a改为static float a
D.
将private float a改为float a
【简答题】What is its business sector?
【单选题】用检查棒校正丝杠螺母副同轴度时，为消除检验棒在各支承孔中的安装误差，可将检验棒转过（）后用测量一次，取其平均值。
A.
60°
B.
180°
C.
90°
D.
360°
【判断题】A mission describes what an organization actually does, what its business is, and why it does it.
A.
正确
B.
错误
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