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【单选题】
How should you signal the crane operator to use the main hoist?（）.A.
Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal
B.
Extend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desired
C.
First tap your elbow with one hand , and then proceed to use regular signals
D.
First tap the top of your head with your first , and then proceed to use regular signals
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【简答题】如果定义了两个相同的常量，前者和后者哪个起作用？
【单选题】关节脱位的描述不正确的是
A.
部分失去正常的对合关系,称为半脱位
B.
肩、肘关节脱位最常见
C.
新鲜脱位是指脱位发生未满3周
D.
关节脱位特殊表现有畸形、弹性固定、关节盂空虚
E.
关节脱位有功能障碍,但无肿胀、疼痛
【单选题】Th i s ship measures ------ that on e.
A.
as twice as long
B.
as twice long as
C.
twice long as
D.
twice as long as