边长在()cm以上的洞口，四周设防护栏杆，洞口下张设安全平网。
A. 90
B. 120
C. 150
D. 200
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夜间在海上，你船看到他船的号灯为品字形三盏绿灯，且在中间这盏绿灯下方还有一盏白灯，则说明驶近该船＿＿＿米以内是危险的。
A. １００００
B. ５０００
C. １０００
D. ５００
Where most likely is Mr. Williams company based？
A. In China
B. In Bluehill City
C. In Victoria City
D. In Hinton City
According to the information, what should employees do if they need to have more details？
A. Visit an authorized dealer
B. Show their employee identifications
Contact the customer service department
D. Call a local department store
水平安装的蒸汽供暖管道变径时，应采用()的大小头变径。
A. 上平
B. 下平
C. 同心
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