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【单选题】
机械波表为 , y 和 x 的单位为 m , t 的单位为 S ,则 有( A )A.
波长为 10/3 m
B.
波速为
C.
周期为 1/2s
D.
波沿 x 轴正方向传播
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皮皮学刷刷变学霸
举一反三
【单选题】The pain and temperature sensation in the left face and the pain and temperature sensation in the right trunk are decreased, and the nerve injury is located in
A.
Subcortical white matter region
B.
Internal capsule
C.
Brain stem
D.
Spinal cord
E.
Peripheral nerves
【简答题】_______ Women seem to experience more pain than men because women and men use different circuits in the brain to block pain.
【单选题】Which of the following is TRUE of central pain?
A.
It's caused by the confusion of the brain.
B.
It usually happens in some experiments.
C.
It can be verified by the thermal grill illusion.
D.
It can be felt when you touch cool objects.
【单选题】To avoid pain in the deep brain stimulation, ___________________.
A.
general anesthesia is usually provided
B.
local anesthesia is usually provided
C.
neither A nor B
【单选题】在森林大量消失的状况下,森林古猿来到地面活动,它们逐渐向着直立行走的方向发展,进化为人。直立行走对人的巨大影响是 ( )
A.
运动更加灵活，活动没有障碍
B.
活动范围扩大，生活资源丰富
C.
解放了前肢，为前肢的灵活运用提供了条件
D.
捕猎更方便，使食物充足
【单选题】缺乏时可以引起高同型半胱氨酸血症的是
A.
维生素 B、叶酸、维生素B12
B.
维生素 B、维生素 B、烟酸
C.
维生素A、维生素D
D.
维生素 C、泛酸
E.
生物素、胆碱
【简答题】Circuits are paths through which electric currents travel, including circuits in the brain that block pain.
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