【多选题】在 神经干动作电位 引导的实验中可观察到
A.
神经干动作电位呈双相性,向上的波和向下的波幅度一定相等
B.
神经干动作电位的幅值会在一定范围内随刺激强度的增大而增大
C.
如果将两引导电极之间的神经夹伤,观察到的为单相动作电位
D.
改变引导电极 两端之间的 距离动作电位的时程不变
【单选题】Scott arrived at the South Pole on January 18 th , only ______ that Amundsen had got there before him.
【简答题】轴的尺寸为 E,则其验收极限按 内缩方式确定,上验收极限为( )mm,下验收极限为( )mm。
【单选题】What is Goodman Brown’s wife’s name?
【单选题】Scott arrived at the South Pole on January 18th, only __________ someone had been there before him.
【单选题】A company exports 50 tons of wheat, the seller delivers the extra 2 tons, then the buyer should ( ).
B.
refuse to take 52 tons
D.
refuse to accept extra 2 tons