液压系统中的职能符号图,要求图形()
A.简洁标准
B.绘制方便
C.功能清晰
D.阅读容易
E.美观大方
参考答案:A, B, C, D
一Can you hear the strange noises?
一There must be _____ _____our homes in the neighborhood.[ ]
A.strange something, visiting
B.something strange, visiting
C.anything strange, to visit
D.nothing strange, to visit
静脉注射时()。
A.针头与皮肤呈5°
B.针头与皮肤呈20°~25°
C.针头与皮肤呈直角
D.针头与皮肤呈60°
E.针头与皮肤呈30°~40°