题目内容
（请给出正确答案）
A、Ancient compass was made of magnetic.
B、Compasses were first used in navigation during 4th century B.C.
C、In Song dynasty, people used compasses in Fengshui.
D、Western countries used compasses to give directions in wars.
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更多“Which sentence about compass i…”相关的问题
第1题
A、A.It can only be used by young people.
B、B. It can only be used by individual person.
C、C.It can be used to post news.
D、D.It can only be used by Chinese.
第2题
A、the decrease of light sensitivity in dark enviroment.
B、the first phase is attributed to the increase of the synthesis of photopigment in cones.
C、the second phase is attributed to the decrease of the synthesis of rhodopsin in rods.
D、finish within one minute.
E、the rhodoposin accumulated in light enviroment in rods decompose quickly in night enviroment.
第3题
A、the first phase is attributed to the increase of the synthesis of photopigment in cones.
B、the decrease of light sensitivity in dark enviroment.
C、the second phase is attributed to the decrease of the synthesis of rhodopsin in rods.
D、finish within one minute.
E、the rhodoposin accumulated in light enviroment in rods decompose quickly in night enviroment.
第4题
A、will be blocked if there is specific information is transmitted to the cortex.
B、disappear if the eyes is closed.
C、could be easily recorded at frontal area
D、could be recorded during sleeping
E、could not be recorded in healthy adult.
第5题
A、The medial meniscus is large and has a "C" shape
B、The lateral meniscus is smaller and has an "O" shape
C、Easy to be injured
D、It's part of the knee joint
第6题
A、Wavelet transforms store large fractions of the strongest of the wavelet coefficients.
B、Wavelet transforms are completely different from discrete Fourier transform (DFT).
C、Each transform has 2 functions: smoothing, difference.
D、Wavelet transforms means applying to pairs of data, resulting in two set of data of length L.
第7题
A、They are accurate in high-dimensional spaces.
B、They are memory efficient.
C、The algorithm is not prone for over-fitting compared to other classification method.
D、The support vectors are the essential or critical training tuples.
第8题
A、Underfitting means poor accuracy both for training data and unseen samples
B、Overfitting means high accuracy for training data but poor accuracy for unseen samples
C、Underfitting implies the model is too simple that we need to increase the model complexity
D、Overfitting occurs too many branches that we need to decrease the model complexity
第9题
A、Some of them are depolarized, some of them are hyperpolarized.
B、The amplitude of the end plate potential is proportional to the amount of Ach released.
C、is attributed to the Ca2+ influx at the end plate.
D、propagate on the end plate without the decrement of the amplitude.
E、followed by refractory period.
第10题
A、Many American college students have part time jobs.
B、There is only one chance to do college entrance exam.
C、There are many classed even at night.
D、Friends and classmates will help you to study.
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