题目内容

当基坑施工深度达到( )时,对坑边作业已构成危险,按照高处作业和临边作业的规定,应搭设临边防护设施。

A. 1m
B. 1.5m
C. 2m
D. 2.5m

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—______I had ! —You really suffered a lot.

A. What a time
B. How a time
C. What time
D. How time

脚手架采用的扣件,在螺栓拧紧扭力矩达( )时,不得发生破坏。

A. 30N·m
B. 40N·m
C. 50N·m
D. 65N·m

施工现场临时用电必须采用( )三相五线接零保护系统的要求。

A. TN-S
B. TN-C
C. TT
D. IT

From the text, we learn that the diary is now owned by______.

A. Tom Brennan
B. an unknown person
C. a Philadelphia magazine
D. the Library Company of Philadelphia

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