清洁钢丝绳油污后，应在钢丝绳上加一层黄油，以防钢丝绳生锈.（)
参考答案：错
下列不属于工业制成品的是[ ]
A．活牲口
B．牛肉罐头
C．皮鞋
D．巧克力糖
Concerning the musculocutaneous nerve, which one is true ？（）
A．it arises from medial cord of brachial plexus
B．it innervates triceps brachii
C．it supplies posterior group of muscles of arm
D．it innervates the coracobrachialis
E．it acompanies with deep brachial vessels
