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【判断题】
管道的直径DN是表示管道的实际内径。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】井下空气中常见的有毒有害气体有哪些？
【简答题】大气中常见的有害气体有哪些？
【单选题】all his courage, he invited Celine to get off the train with him．
A.
To gather
B.
Gathered
C.
Gathering
D.
Being gathered
【简答题】常见的窒息性气体有哪些？
【简答题】井下常见的有毒有害气体有哪些?
【简答题】矿井中常见的有害气体有哪些？
【单选题】Henry set up a club for football fans, ________ he invited all his friends．
A.
for whom
B.
to whom
C.
to which
D.
from which
【简答题】常见的刺激性气体有哪些?
【单选题】all his courage, he invited the lady to get off the train with him.
A.
Being gathered
B.
Gathered
C.
To gather
D.
Gathering
【简答题】He invited all his ______ to join in his wedding party. A) comrades-ins-arms B) comrades-in-arm C) comrade-in-arms D) comrades-in-arms
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