（Ⅰ）设 $\angle OMN=x\left(rad\right)$ ，将 $L$ 表示为 $x$ 的函数；

（Ⅱ）试利用（Ⅰ）的函数关系式确定宣讲站 $O$ 的位置，使宣讲站 $O$ 到三个乡镇的距离之和 $L\left(km\right)$ 最小．

“互联网+”“众创空间”“小短假”“阅兵蓝”“人民币入篮”等十大新词记录了丰富多彩的2015。这体现了（  ）

在“文化大革命”期间，***刘少奇被迫害致死，这一事件突出反映了（    ）

    Wondering where to watch the fireworks on the fourth Friday of July? Here are some restaurants where you can sit, grab a bite to eat and watch the show.

    The Roof on Wilshire offers a view of the city, so chances are that you'll be able to catch a fireworks show while you're up there. The restaurant will also offer an all-you-can-eat menu for $20 that includes all beef hot dogs and sweet potato chips. The festivities will take place from 2 to 11 pm. Reservations are recommended. 6317 Wilshire Blvd. Los Angeles, (323) 852-6002.

    Whiskey Red's is located in Marina Del Rey. Beginning at 5:30 pm, it will include live music from Jack of Hearts. The event is free and open to the public. Guests can make reservations from 5:30 to 10 pm. It costs $59 to reserve a seat on the patio(露台) and $49 for indoor seating. Kids aged 5 to 12 need $25 for a seat outside and $20 for an indoor seat. Kids aged four and below are free. 13813 Fiji Way, Marina Del Rey, (310) 823-4522.

    High Rooftop lounge in Venice at the top of the Hotel Erwin offers views of the Venice coastline. The fireworks show starts at 9 pm. The rooftop lounge (休息室) offers a full menu of cocktails and a selection of snacks. 1697 Pacific Avenue, Venice Beach, (800) 786-7789.

    The last one is Carbon Beach Club at the Malibu Inn. Here you can see fireworks from a seat on the restaurant's oceanfront balcony from 6 to 9:30 pm. Reservations are recommended. 22878 Pacific Coast Hwy, Malibu, (310) 456-6444.

该图所示山西省能源调出结构变化所带来的影响是（ ）