1984年10月15日,为我国南极考察题词:“为人类和平利用南极做出贡献”的国家领导人是哪位?
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风湿性疾病活检组织病理改变对诊断有决定性意义,并有指导治疗的作用。如唇腺活检有助于()
A. 诊断干燥综合征
B. 诊断SLE
C. 诊断类风湿性关节炎
D. 诊断皮肌炎
E. 辅助诊断狼疮肾炎
在船舶抗沉性计算中,常用的方法有()。 ①重量增加法; ②排水量固定法; ③浮力损失法
A. ①②③
B. ②③
C. ①
D. ③
The Experimental Lighthouse-buoy has no navigational significance and may be removed at will.The above sentence means().
A. It's of no use for navigation and would be removed with notice
B. It's useful in navigation and may be removed without notice
C. It's helpless in navigation and may be removed without notice
D. It's helpful in navigation and may be removed without notice