钢塔柱脚下面的支承构造，应符合（）。需要填垫钢板时，每叠不得多于（）。
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离子交换器的反洗目的是（）、清除悬浮物、排除碎树脂和排除树脂中的气泡。
某男，47岁，胸胁支满，目眩心悸，短气而咳，舌苔白滑，脉弦滑。宜选用（）
A. 苓桂术甘汤
B. 真武汤
C. 实脾散
D. 五苓散
E. 猪苓汤
头痛在临床中除由肝阳上亢、外伤血瘀阻络所致外，还可因（）、（）而引起。
A ship station on receiving a shore-to-ship distress alert should（）.
A. keep silence
B. interfere with such communication
C. establish communication as directed and render such assistance as is required and appropriate
D. refuse communication as directed and render such assistance as it required and appropriate
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