下列头颈部恶性肿瘤中,最常转移到颈部淋巴结的是()
A.甲状腺癌
B.喉癌
C.鼻咽癌
D.口腔癌
E.唇癌
参考答案:C
This novel was about an unbelievable but g 小题1: adventure. Its author was a black businessman who was b 小题2: up in America. In 1956, he visited Africa, his birthplace. One day, when he was w 小题3: on the pavement near the bay enjoying the sea scenes, he lost his money and passport that he kept in an e 小题4: So he went to the embassy to s 小题5: help, but the ambassador with rude manners didn't p 小题6: his staff to help though he bowed to him. S 小题7: at his impatient face, he understood that it was the f 小题8: of his skin colour that accounted for their rejection. So he decided to take a c 小题9: to sail on a small boat home. He met a large amount of difficulty but was never stopped. On the c 小题10: , difficulty pushed him to go ahead harder.
某船舶机械的振动属于低频振动,在对该机械进行振动监测时,应选用()传感器采集振动信号.
A.加速度
B.速度
C.位移
D.压力