副交感神经的作用是()
A.心率加快
B.内脏及皮肤血管收缩
C.膀胱与直肠收缩促进排泄
D.血糖升高
E.机体消耗增加
参考答案:C
支座顺桥方向及横桥方向从铰平面起至支承垫石顶,反力的传布角度均不应大于()。
A、30°
B、45°
C、60°
D、90°
As the popular saying ______, “Laugh and the whole world laugh with you. Cry and you cry alone.”
A.speaks
B.goes
C.tells
D.talks