Why did Linda choose eggs to lose weight?
A. Because she believed eggs were not very expensive and also contained a lot of protein.
Because she had been told that eating eggs could help her to have a fine figure.
C. Because she liked eggs so much that she could not stand if she didn't eat eggs every day.
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The experts' study on the problem of erosion can ______.
A. warn people whose homes are in danger
B. provide an effective way to slow it down
C. help the prevent it from worsening
D. lead to its eventual solution
在确定水泵的安装高度时,利用水泵允许吸上真空高度Hs,此Hs为水泵进口真空表HV的最大极限值,在实用中水泵的()值时,就意味水泵有可能产生气蚀。
A. Hv=Hs
B. Hv<Hs
C. Hv>Hs
D. Hv=Hs
系统特征方程为D(s)=s3+2s2+s+2=0,则该系统()。
A. 右半S平面有1个闭环极点
B. 稳定
C. 右半S平面有2个闭环极点
D. 临界稳定
现代微型计算机中所采用的电子器件是______。
A. 电子管
B. 品体管
C. 中小规模集成电路
D. 大规模集成和超大规模集成电路