To enter Class B airspace, such as an approach to a major metropolitan airport, an explicit ATC clearance is required.
需要持有明确的空中交通管制许可才能进入B类空域，如接近一个大都会机场。
When an obstacle appears in the region B in Fig. 2, clearance values become zero.
如果一个障碍物呈现在图2中的B区时，间隙值变为零。
2 measure the B dimension of the flange clearance and measure four points on the circumference.
测量法兰间隙b尺寸，在圆周上测四点（均布）。
E&B fleet also can provide reliable cross-zone customs clearance service.
永鲜物流公司还可以提供可靠的异地转关服务。
ObjectiveTo study the mechanisms of the hepatitis B virus(HBV) clearance with clinical data.
目的探讨急性乙型肝炎患者血清乙型肝炎病毒（HBV）清除及临床转归的机制。
Shanghai F. B. o international logistics Co., Ltd provides agent services in transportation, customs clearance, land transportation, storage for export and import of cargos via airlines.
上海菲铂欧国际物流有限公司经营国际货物的空运出口、进口、报关、陆运、仓储等多项服务。
Shanghai F. B. o international logistics Co., Ltd provides agent services in transportation, customs clearance, land transportation, storage for export and import of cargos via airlines.
上海菲铂欧国际物流有限公司经营国际货物的空运出口、进口、报关、陆运、仓储等多项服务。
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