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单选题
Pressure Altitude refers to altitude measured from standard sea level pressure (29.92 in. hg.) by a pressure or barometric altimeter. It is the indicated pressure altitude corrected for position and instrument error. In this Handbook, altimeter instrument errors are assumed to be zero.
A
气压高度指从标准大气压(29.92英寸高度)测量得到的值。由压力或气压高度计测得。它是排除位置和仪表误差的指示压力值。在本手册中，假定高度计仪器误差为零。
B
气压高度指压力计或气压计高度计用于从标准海平面压力（29.92英寸汞柱）计算的高度。它是减去位置和仪器误差后的指示压力高度。在本手册中，高度计的仪器误差为零。
C
气压高度指用气压高度表测量的（飞机）距离标准海平面（气压值29.92英寸汞柱）的高度。所指示高度是一种对位置误差和仪表误差修正后的高度。在本手册中，假定高度表仪表误差为零。
答案解析
正确答案：B
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