采用堵塞换热管消漏的方法时,一般堵管的数量要小于或等于总换热管数的()%。
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腹部闭合性损伤病人出现休克,腹穿抽出不凝固血液术前最主要的治疗措施是().
A. 保持安静
B. 防止休克
C. 止痛
D. 胃肠减压
E. 抗生素
在某地路测中发现第一邻频干扰,但还能够正常通话,依据协议,C/A至少满足().
MV SUDAN/MEAN AT 0200UTC IN POSITION 40.44N 141.52E PASSED A DERELICT ABOUT 40 TONS HALF SUBMERGED AND IS DRIFTING. This cable says that she met with possibly().
A. a floating wreck
B. a survivor at sea
C. a man who had fallen overboard
D. a drilling rig