开凿或延伸斜巷(井)时,必须做到一坡三挡,说出其具体内容?
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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
交流电变化的快慢一般可用()来衡量。
A. 频率和初相
B. 周期和有效值
C. 角频率和初极
D. 频率周期或角频率
交易营销认为价格不是主要的竞争手段。
A. 正确
B. 错误