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【单选题】整圆的直径为φ40mm,要求由A (20， 0)点逆时针圆弧插科并返回A点，其程序段格式为()。
A.
G03 X20.0Y0I20.0 JO F100
B.
G03 X20.OY0 I-20.0 JO F100020.0
C.
G03 X20.0 YO R- 20.0 F100
D.
G03 X20. 0 YO R20.0 F100
【单选题】Color is very important to most animals for it helps them to get along in the world. Color (21) to make an animal difficult for its enemies to (22) . Many animals match their (23) so well that as lon...
A.
Even if
B.
Unless
C.
However
D.
As long as
【多选题】全背按摩的正确方法是（）
A.
协助患者俯卧，露出背部
B.
先以热水擦洗，再用小毛巾蘸50%乙醇按摩
C.
从骶尾部开始，用手掌沿脊柱旁向上按摩
D.
至肩部时，以环状动作向下按摩
E.
用拇指指腹由骶尾部开始沿脊柱按摩至第7颈椎处