防遭受直击雷的有效措施是装（）。 阀型避雷器。 放电间隙。 避雷针。 管型避雷器。
Deficiencies in the categories of Life-saving, Safety in General, Fire-fighting Appliances and Load Line （） approximately 66% of all deficiencies. account as。 account for。 account to。 account of。
A tool consisting of a handle and releasable chain used for turning pipe or fittings of a diameter larger than that which a pipe wrench would fit is called（）. breakout wrench。 makeup tongs。 chain tongs。 pipe spinner。
在3C产品中，京东商城的价位要比天猫高，原因在（）。 运营成本。 进货价。 发票上。 利润高。
A sufficient amount of chain must be veered when anchoring a vessel to ensure（）. the vessel has enough room to swing while at anchor。 the anchor flukes bite into the ocean bottom。 there is sufficient weight from the anchor and chain to prevent dragging。 there is more chain out than there is in the chain locker。
列入《强制性产品认证目录》的产品，应当经过认证并标注认证标志后，方可（）
