Which of the following radar contacts will present the most immediate danger?（）.
A vessel on the starboard bow whose bearing is changing and range is decreasing
B. A vessel on the starboard bow whose bearing is steady and range is increasing
C. A vessel on the port bow whose bearing is steady and range is decreasing
D. A vessel on the port bow whose bearing is changing to the left and range decreasing
（）和（）协调统一是作物引种成功的关键，也是引种的基本原则。
货物在运输过程中，由于哪些原因，造成的滞留时间，应从实际运到日数中扣除？
患者女，50岁。黄疸，B超显示：肝内胆管直径约1cm。应进一步选择的检查是（）。
A. 静脉胆道造影
B. 核素扫描
C. 经皮肝穿刺胆道造影
D. 十二指肠低张造影
E. 腹腔动脉造影
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