短接法只适用于检查压降极小的导线和触头之类的（）故障。
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船舶电网应有过载保护、短路保护和防止电网单向运行保护。
A. 正确
B. 错误
开凿或延伸斜巷（井）时，必须做到一坡三挡，说出其具体内容？
亚健康的神经系统临床表现有：（）。
A. 头痛
B. 眩晕
C. 昏厥
D. 耳鸣和麻木
When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
A. The objects lie in a straight line
B. The vessel is inside of a triangle formed by the objects
C. The vessel is outside of a triangle formed by the objects
D. A circle will pass through your position and the three object
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