Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it – only the code that is actually holding the reader can.
One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
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他向BBC中文表示，問卷寫法會讓居民認為「時間」作為唯一考慮因素，甚至「慢慢令到想選擇不同計劃的人有一個對立面」。他又指，問卷第一條問題是向居民查詢「政府應考慮哪些重要原則」，質疑為何要居民要代替政府思考，而目前居民亦無政府所擁有的資訊，難以有客觀答案。