动脉穿刺的常用部位有()()()()。
参考答案:桡动脉;锁骨下动脉;肱动脉;股动脉
请按照题目要求作图
(1)已知经水面反射的光线OB,请在图甲中画出它的入射光线AO及其在水中大致的折射光线OC
(2)商场的电梯匀速向上运动,请在图乙中画出站在电梯上相对电梯静止的人受到的作用力的示意图.
Most of us think of games as child* s play, but games _____ children' s thinking and develop skills like problem solving and communication.
A.sharpen
B.seize
C.adore
D.apply