子宫颈淋巴转移首先侵犯()
A.腹股沟浅淋巴结
B.腹股沟深淋巴结
C.盆腔淋巴结
D.腹主动脉旁淋巴结
E.肠系膜淋巴结
参考答案:C
We _____ know the answer.[ ]
A. aren't
B. doesn't
C. don't
D. mustn't
给桅杆配备缆绳时,从缆绳长度考虑,宜按什么原则?