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设有语句int a=3;,执行语句a =a-=a*a;后,变量a的值是( )
“现代型”质量观是一个完整的、有机的整体观念,其基本特征是:
汇总收款凭证是根据( )汇总编制的。
若两电对的电子转称移数分别为1和2,为使反应完全程度达到99.9%,两电对的条件电位差至少应大于
取样是指从( )中选择有代表性的样本。
在下列几组协议中,哪一组( )是网络层协议?
A computer system includes a computer, peripheral devices, and software. The electric, electronic, and mechanical devices used for processing data are referred to as hardware. In addition to the computer itself, the term “hardware” refers to components called peripheral devices that expand the computer’s input, output, and storage capabilities. Computer hardware in and of itself does not provide a particularly useful mind tool. To be useful, a computer requires a set of instructions, called software or a computer program, which tells the computer how to perform a particular task. Computers become even more effective when connected to other computers in a network so users can share information.
以下会引起“天花板效应”的是
课题“计算机辅助教学在化学教学中的应用研究”,体现该课题的
下列汞化合物毒性最大的是--------------。
在T、p时,理想气体反应C2H6(g)=H2(g) C2H4(g)的Kc/Kx为
电池反应中当反应物和产物达到平衡的时候,电池电动势为 。
Stern-Gerlach实验证实了
波函数、(c为任意常数)[含图片]
[含图片]
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