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【单选题】
Nowadays, a standard for measuring power has changed. These changes foretell a new standard for measuring power. No longer will a nation's political influence be based solely on the strength of its military forces. Of course, military effectiveness will remain a primary measure of power. But political influence is also closely tied to industrial competitiveness. It's often said that without its military the Soviet Union would really be a third-world nation. The new standard of power and influence that is evolving now places more emphasis on the ability of a country to compete effectively in the economic markets of the world. America must recognize this new course of events. Our success in shaping world events over the past 40 years has been the direct result of our ability to adapt technology and to take advantage of the capabilities of our people for the purpose of maintaining peace. Our industrial prowess (杰出才能) over most of this period was unchallenged. It is ironic that it is just the prowess that has enabled other countries to prosper(繁荣) and in turn to threaten our industrial leadership. The competitiveness of America's industrial base is an issue bigger than the Department of Defense and is going to require the efforts of the major institutional forces in our society--not be a strong force in the process because we will. But we simply cannot be, nor should we be, liked upon by others as the savior (救星) of American industry. Now a nation's political influence depends on ______.
A.
the strength of its military forces
B.
its ability to compete in industry
C.
economic markets
D.
both A and B
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【简答题】在烧杯中盛有体积为2.0×10-2dm3,浓度为0.10 mol.dm-3的氨水,逐步向其中加入体积为VHCl,浓度为0.10 mol.dm-3的HCl溶液,试计算当加入HCl溶液的体积分别为: (1)VHCl=1.0×10-2dm-3; (2)VHCl=2.0×10-2dm3; (3)VHCl=3.0×10 dm-3时,混合液的pH。
【单选题】考虑二元函数f(x,y)的下面四个性质 (1)f(x,y)在点f(x,y)处连续; (2)f(x,y)在点f(x,y)处的两个偏导数连续; (3)f(x,y)在点f(x,y)处可微; (4)f(x,y)在点f(x,y)处的两个偏导数存在; 若用P=>Q表示可由性质P推出性质Q,则有( )
A.
(2)=>(3)=>(1)
B.
(3)=>(2)=>(1)
C.
(3)=>(4)=>(1)
D.
(3)=>(1)=>(4)
【单选题】考虑二元函数f(x,y)的下面四个性质 (1)f(x,y)在点(x,y)处连续; (2)f(x,y)在点(x,y)处的两个偏导数连续; (3)f(x,y)在点(x,y)处可微; (4)f(x,y)在点(x,y)处的两个偏导数存在; 若用P=>Q表示可由性质P推出性质Q,则有( )
A.
(2)=>(3)=>(1)
B.
(3)=>(2)=>(1)
C.
(3)=>(4)=>(1)
D.
(3)=>(1)=>(4)
【单选题】在标准状况下,1摩尔的任何气体所占的体积称为
A.
气体摩尔体积
B.
摩尔体积
C.
摩尔浓度
D.
气体浓度
E.
标准状况体积
【多选题】下列关于香港海洋公园的描述,正确的有( )。
A.
是东南亚最大的海洋主题休闲中心
B.
拥有全世界第二长的户外电动扶梯
C.
是一座集海洋奇观、游乐设施及主题酒店于一体的世界级主题公园
D.
拥有东南亚最大的海洋水族馆及主题游乐园
E.
拥有亚洲第一个水上游乐中心
【单选题】有关数控机床坐标系的说法,其中( )是错误的。
A.
刀具相对静止的工件而运动的原则
B.
Z轴的正方向是使工件远离刀具的方向
C.
标准的坐标系是一个右手直角笛卡尔坐标系
D.
主轴旋转的顺时针方向是按右旋螺纹进入工件的方向
【多选题】香港海洋公园拥有( )。
A.
全东南亚最大的海洋水族馆及主题游乐园
B.
露天游乐场、海豚表演
C.
千奇百怪的海洋性鱼类、高耸入云的海洋摩天塔
D.
有惊险刺激的越矿飞车、极速之旅,堪称科普、观光、娱乐的完美组合
【单选题】硫化氢的体积比浓度指硫化氢在空气中的体积比,常用ppm表示,则硫化氢的阈限值、安全临界深度和危险临界浓度分别为()。
A.
10ppm;20ppm;100ppm
B.
15ppm;30ppm;150ppm
C.
15ppm;20ppm;150ppm
D.
10ppm;30ppm;100ppm
【判断题】公平正义是社会主义法治建设的根本价值追求。( )
A.
正确
B.
错误
【多选题】若f(x,y)在点(2,3)连续,则
A.
存在
B.
f(2,3)存在
C.
不一定存在
D.
不存在
E.
f(2,3)不存在
F.
f(2,3)不一定存在
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