请画出常一线详细流程（包括阀门，设备编号，扫线汽，放空点，跨线阀）。

客运专线双块式轨枕支承层，28天现场一组取芯试件强度的平均值设计要求为（）。

A、≥15MPa；

B、10～20MPa；

C、15～20MPa。

图为某日上海附近地区海平面气压分布图。读图完成问题。

小题1:当上海地区为图中的天气系统控制时，可能出现的天气是（  ）

A．伏旱天气

B．阴雨连绵天气

C．高温多雨的天气

D．台风天气小题2:夏季当该天气系统较常年的位置或强弱异常时，可能出现的情况是（  ）

A．该天气系统位置偏南时，我国北方地区易发生洪涝灾害

B．该天气系统位置偏北时，我国北方地区易发生干旱灾害

C．当该天气系统姗姗来迟时，雨带就会长时间滞留在江淮地区

D．当该天气系统北跃时间提前，我国南方会发生洪涝灾害

在行车线路上作业时，要在来车方向40米外设警戒，在斜巷作业时要在（）设警戒，并有专项防滑措施。

A、上车场

B、下车场

C、上下车场

D、巷道内

It was the night of the full moon, a time which always drives Java’s young people mad with excitement.

Fireworks were lit long before the moon (1) . The big noise brought people out (2) the warm night to enjoy the interesting scene. Everywhere, there were the paper remains of (3) fireworks lying on the ground. Little boys (4) more and covered their ears as they waited (5) for the explosions.

The moon appeared above the horizon: huge, (6) ball high above the city, and the (7) filled with people, as Java began to enjoy one of the year’s greatest (8) ."the Night of the Full Moon", a festival that is especially popular (9) young people.

More and more young Javanese (10) together and walked slowly through the (11) . Joking and chatting, they moved towards the mountain (12) the city. They continued to climb (13) they reached the old temple at the (14) of the mountain.

After they were (15) the temple, they drank their water and ate their mooncakes—delicious home-made ones, (16) of dried fruit and nuts. Outside, on the mountain, young people (17) cross-legged in circles, chatting and telling each other jokes. And (18) , in their hundreds, more young people continued to make their way up the mountain to (19) the brightly shining moon.By midnight, the fireworks had stopped shooting up from the (20) city in the valley below them. But during the night, the sound continued to be heard from the distance.

15（）

A.inside 

B.near 

C.off 

D.across

简述难产的助产原则。