皮皮学，免费搜题
登录
搜题
【单选题】
<600>气体管路进行吹扫时,应保证气速不小于( ) m/ s。A.
20
B.
30
C.
40
D.
50
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
【单选题】We regret having received your offer too late, BECause we ____ our needs elsewhere.
A.
already cover
B.
already covered
C.
have already cover
D.
had already covered
【单选题】We regret to ________ you that our library will be closed next Wednesday, Thursday and Friday for the sports meeting. [ ]
A.
say
B.
speak
C.
inform
D.
notice
【单选题】We regret having received your offer too late, because we ____ our needs elsewhere.
A.
already cover
B.
already covered
C.
have already cover
D.
had already covered
【单选题】Much () our regret, we cannot ship the goods within the time limit of the L/C owing to the unforeseen difficulties on the part of mill.
A.
for
B.
on
C.
to
D.
at
【单选题】If we ________ now to protect our mother river ---Li Jiang River , we ‘ll live to regret it.
A.
haven’t acted
B.
won’t act
C.
don’t act
D.
hadn’t acted
相关题目：