限制物体作某些运动的装置称为约束,球体被摆置在地坪面上的约束称为()。
A.柔性约束;
B.光滑接触面约束;
C.铰支座约束;
D.固定端支座约束。
参考答案:B
In a Natural Approach class, in the pre-production stage, the teacher provides comprehensible input, maintains focus on the ______ and helps lower affective filters.
防风通圣散主治证为()
A.风热壅盛,表里俱实之瘾疹瘙痒
B.风疹,湿疹
C.偏头痛
D.破伤风
E.瘾疹