题目内容

This problem was observed in some people in their thirties, but it was still not ________ in some sixty-and-seventy-year-olds.

A. compatible
B. diverse
C. significant
D. evident

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It’s a shame that I have learned French for 10 years and yet I am unable to ________ more than a few sentences.

A. steer
B. utter
C. spill
D. occur

将下列单词与其释义匹配

逐次逼近A/D转换的速度比积分式A/D转换的速度________

A. 慢
B. 快
C. 相同

某双斜积分式DVM，基准电压为 Ur=6.000V，计数脉冲频率为 fc=1MHz，计数器满量程为 N1=80000，求（1）被测电压为 Ux=1.500V 时，计数器计数值 N2 为多少？（2）采样时间 T1 和反向积分时间 T2 分别为多少ms？