井下电机车运输通讯方式有三种即（）。A、信号灯 B、隔爆或本质安全型电话机 C、载波电话

阅读理解。

     I have two new friends in our class. They are American girls. Their names Lucy and Lily. They are twelve.

They are twins. I am Wei Hua. I am Chinese. I am twelve, too. We are in No.6 Middle School. We are in Class

Two, Grade One. Lucy is Number 5 in Row 5. I am Number 5 in Row 8. Lily is behind Lucy. We are good

friends.

1. How old is Lily?

A. She's 11

B. She's 12

C. She's 13

D. She's 14

2. What class are the twins in?

A. They are in Class I

B. They are in Class 4

C. They are in Class 3

D. They are in Class 2

3. Are they students or teachers?

A. Yes, they are.

B. No, they aren't.

C. They are students.

D. They're teachers.

下列关于胎漏的叙述中不正确的是（）。

A.下腹酸坠、疼痛

B. * * 出血

C.查尿hCG（+）

D.有早孕反应

E.B超：宫内早孕

为了尽量减小粉煤对管道的磨损，设计要求把粉煤输送的流速控制在（）以内。

A.2～8m/s

B.5～10m/s

C.3～10m/s

D.4～9m/s

某办公楼装修改造施工中，根据设计及使用功能，大量采用轻质隔墙。卫生间采用压花玻璃隔墙，办公室大部分采用轻钢龙骨纸面石膏板隔墙。，会议室700m²，主要采用木龙骨、樱桃木墙面、中间有两道活动隔墙，可根据使用要求进行分隔。公共区域有玻璃砖墙作为装饰。项目部在本项目施工中制定了确保轻质隔墙施工质量的控制措施和质量验收标准。

石膏板应裁制准确，安装牢固时隔墙端部的石膏板与周围的墙、柱应留有（）的槽口。

A．2mm

B．3mm

C．4mm

D．5mm

车皮系数和容积系数是衡量矿车的两个重要经济技术指标，这两个系数越大越好。