韩新任总统文在寅本周表示：前任政府部署“萨德”的决定不符合民主程序，是一个错误的决定。 “萨德”入韩为朝鲜半岛局势带来“不必要的紧张”，韩国应暂停“萨德”部署，新政府应对“萨德”入韩问题重新进行审视，应学会对华盛顿政府说“不”。 

Aircraft batteries are used to start engines while initiating taxiing or the APU. The batteries are also used to power the airplane interiors and services (such as broadband and air conditioning). The major battery chemistries that are generally used as modern aircraft batteries are lithium-based (Li-ion and lithium iron phosphate), nickel-based (Ni-Cd or nickel metal hydride), and lead-acid. Lead-acid batteries are usually employed in light and general aviation aircraft. The nickel-based batteries dominate larger aircraft and helicopter applications, which are being replaced by the lithium-based batteries since the past decade.

Attack helicopters or gunships are designed to carry heavy armaments such as antitank guided missiles (ATGMs) like Hellfire, auto canons, unguided rockets, heavy machine guns, and air-to-air missiles. The air-to-air missiles carried by them are mostly deployed for self-defense purposes. In addition, attack helicopters attack enemy tanks, flanks, and rear, which provides strategic support and assistance to the ground forces to maneuver and engage with hostile forces. In recent years, the threats imposed on civilian life have increased rapidly, particularly due to the rise in terrorism and crossborder insurgent activities. Therefore, development and procurement of attack helicopters have been increased in recent years to have a highly efficient and effective aerial attack force.

Airport passenger screening systems are being used at the airport security checkpoints since decades. Earlier, most of the airport passenger screening process relied on hand-held metal detectors or walk-through metal detector for passengers and X-ray systems for carry-on items. However, the evolving security threats and the inability of metal detectors to detect non-metallic objects and explosives are nudging many airports to implement advanced imaging technologies and procedures to screen passengers for explosives and non-metallic weapons.

Line maintenance is a part of aircraft MRO, which refers to the works on discrepancies as per the requirements of the flight crew in order to ensure airworthy condition of the aircraft. These works are conducted before or in between flight operations on a regular basis. Line maintenance involves two components: labor and materials. Some of the line maintenance activities are A checks, weekly/overnight checks, daily checks, transit checks, and pre-flight checks.

The global baby stroller and pram market has been registering positive growth over the last few years and is shaping up to become one of the top competitive markets at a global level. With the rise in globalization, ample growth opportunities are being created in the market.

An aerostat uses gases lighter than air such as hydrogen, helium, as well as hot air, which helps the aerostat to generate airlift. Aerostats include powered airships and unpowered balloons that are tethered to the ground. These are generally used for intelligence, surveillance, and reconnaissance (ISR) purposes by the military forces and also for tourism and civilian observations. An aerostat surveillance system possesses the long-endurance capability, which is not feasible with a fixed-wing aircraft. The alternatives to aerostats (such as unmanned aerial vehicles (UAVs)) are battery dependent, which results in operational failures.

Aerospace fasteners have evolved over the years with the constantly changing aerospace industry. These components are widely used in commercial and military aircraft, ballistic missiles, rockets, and associated aftermarket services. The aerospace industry employs a wide range of fasteners such as bolts, nuts, screws, rivets, and pins.

据报道，4月20日19时41分，搭载着天舟一号货运飞船的长征七号遥二运载火箭成功点火发射，此后与天宫二号成功完成对接。此次任务是我国载人航天工程第二步收官之战，将为18年开建正式空间站奠定坚实基础。未来十年我国载人航天驶入快车道，市场规模接近500亿元，重点推荐航天电子、中国卫星。

航母下水和 C919 首飞预期，或带动军工行情。腾讯网报道，4 月23 日，国产大型客机Ｃ919 进行高滑抬前轮试验取得成功；辽宁省大连市香炉礁码头观察发现，国产航母的船坞开始注水。我们认为 C919 首飞和国产航母下水的时间越来越近了，短期两大重器标志性的时间结点或将带动军工行情。当前，中证军工指数已经回到了 2015 年牛市启动前的水平。