【判断题】金属导电的原因是在金属晶体中存在金属离子。
【判断题】中位值滤波能有效地克服因偶然因素引起的波动或采样器不稳定引起的误码等造成的脉冲干扰。
【单选题】What is the author's main purpose in writing this passage?
A.
To criticize banks that now indulge people to spend insensibly.
B.
To analyze causes of American economic crisis.
C.
To raise people's consciousness of prudent spending.
D.
To call for American leaders to learn from nation builders.
【简答题】What is a thesis statement in academic writing?
【单选题】What is the authors purpose in writing the passage?
A.
To instill confidence in the young about raising children.
B.
To advise couples to think twice before having children.
C.
To encourage the young to take care of the elderly.
D.
To appeal for tax reduction for raising children.
【单选题】金属导体之所以具有良好的导电性,是因为金属导体中存在大量的( )