肝内胆管结石手术治疗的原则是：__________、_____________、__________和___________。
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When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
A. a straight line drawn on the chart approximates a great circle
B. the chart should not be used outside of the standard parallels
C. the course angle is measured at the mid-longitude of the track line
D. distance cannot be measured directly from the chart
中兴S320单端设备最多可接入（）个E1。ZXMPS320单端设备最多可接入（）个E1。
A. 63；252
B. 63；63
C. 63；126
D. 126；126
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