To prevent damage by and to storage batteries aboardsmall passenger vessels they should be located().
A. in trays constructed of material that is resistant to the electrolyte
B. so as to prevent movement when the vessel pitches and rolls
C. in a well ventilated area
D. All of the above
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地铁正线信号的种类有()。
A. 红色、黄色、绿色、黑色
B. 红色、黄色、绿色、白色
C. 红色、黄色、绿色、蓝色
D. 红色、黄色、绿色、红黄色
Crohn病发生腹痛的原因没有:()
A. 不完全或完全性肠梗阻
B. 急性肠穿孔
C. 腹水
D. 局部肠痉挛
E. 肠麻痹