货物突出平车车端装载，突出端的半宽超过允许突出端梁的限制时，应更换车辆。
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A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.
A. the system is fully charged
B. there is air leaking in from the condenser
C. ice crystals are forming in the refrigerant
D. the system contains less than a full charge of refrigerant
近年来，我国体育经济学研究的热点领域和主要学术进展大体反映在哪几个方面？
简述在绘总布置图制动系布置时，需要注意一些什么问题或如何布置才是合理的？
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