What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?()
A. Repeat the message using any other channel on which you might attract attention
B. Key the microphone several times before transmitting again
C. Turn up the volume on the receiver before transmitting again
D. Report the problem to the head electricia
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AutoCAD 2004中,用户可以创建线框、表面、实体三种形式的三维模型。
A. 正确
B. 错误
患者,男,42岁。胁肋胀痛,脘腹灼热疼痛,口苦,舌质红,脉弦数,用药应首选的药物是()
A. 木香
B. 香附
C. 乌药
D. 川楝子
E. 佛手