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Petrochemicals – of which plastics are the dominant output – now account for roughly 75% of net global oil-demand growth, and are projected to become the largest driver of future oil demand. Plastic production has already doubled in the past two decades. Major oil companies are responding accordingly. Recent consolidation – including a $60bn merger creating one of the world’s largest plastics producers – reflects a deliberate pivot toward petrochemical assets as a long-term demand anchor.，详情可参考服务器推荐
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0;},get nextRefresh() {return $store.User.meteredStatus?.nextRefresh ? $dateUtils.formatDate($store.User.meteredStatus.nextRefresh) : '';},get saraComponent() {if (!this.isReady) {return null;}return JSON.stringify({name: this.hasCredits ? 'article-meterwall' : 'article-paywall-secondary-upsell',title: this.hasCredits ? 'Default metered - Unlock wall' : 'Default metered exhausted - Spplus upsell',type: 'paywall',});},get targetId() {if (!this.isReady || this.hasCredits) {return null;}return $appUtils.isApp ? 'paywall-secondary-upsell-app' : 'article-paywall-secondary-upsell-web';},init() {if ($store.User.meteredStatus?.isReady) {this.isReady = true;} else {$subscribe('USER_METERED_STATUS_UPDATED',this.onUserMeteredStatusUpdated,this);}},onUserMeteredStatusUpdated() {this.isReady = true;},async unlockDocument() {this.enterPendingState();try {await $meteredService.unlockDocument(this.documentId, this.title);this.resetState();window.location.reload(true);} catch (error) {$notificationService.addNotification({type: 'NOTIFICATION_TYPE_FAILURE',headline: 'Beitrag freischalten',description: 'Der Beitrag konnte nicht freigeschaltet werden',});this.resetState();}},enterPendingState() {this.isLoading = true;this.isDisabled = true;},resetState() {this.isLoading = false;$cooldown(2000, 'isDisabled');}}" data-area="paywall" :data-sara-component="saraComponent" :data-target-id="targetId" data-has-spmetered-visible
Once a transaction is confirmed, it is placed in a block after the confirmation. All of the blocks are chained together to create a permanent history of every transaction.，详情可参考一键获取谷歌浏览器下载
* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓