不定项选择

18. 庖丁解牛中的厨师“丁”手中的刀子已经用了九年。‍
A．正确
B．错误

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问答题
加快建设全国统一大市场的主要目标是（）。
答案： A.持续推动国内市场高效畅通和规模拓展
B.加快营造稳定公平透明可预期的营商环境
C.进一步降低市场交易成本
D.促进科技创新和产业升级
E.培育参与国际竞争合作新优势
正确答案：A；B；C；D；E
多项选择题
Which of the following is false about the relationship between DTFT and CTFT？
A、DTFT is only different from CTFT on the continuity and discreteness of time domain signal and the units in frequency domain. And DTFT can be transformed CTFT.
B、
DTFT is always used to represent the spectrum of discrete-time signals，while CTFT is used to represent the spectrum of continuous-time signals.
C、Spectrum of DTFT can be obtain by extending the continuous-time signal periodically by sampling frequency.
D、DTFT and CTFT are totally different concept for discrete-time signal and continuous-time signal and cannot be connected.
单项选择题
化学反应的主产物是
A．
B．
C．
D．
单项选择题
海啸/水灾的护理要点不包括（）。
问答题
子女与父母相处时应该注意的礼仪规范
答案：做为子女首先要孝敬父母；子女要听从父母的教诲；经常问候父母，跟父母沟通；作为学生要懂得节约不去攀比，也要在生活上照顾父母...