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【简答题】
工业产品生产许可证有效期为（）年，但是，食品加工企业生产许可证的有效期为（）年。生产许可证有效期届满，企业继续生产的，应当在生产许可证有效期届满（）个月前向所在地省、自治区、直辖市工业产品生产许可证主管部门提出换证申请。
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【简答题】机械零件主要有哪些失效形式?
【简答题】阅读理解。 'Susan, I'll miss you. Don't forget me,' a girl wrote to me on the first page of a notebook. It was a present given by one of my students when I attended (参加) the 'Go-to-the-countryside' program...
【简答题】机械零件主要有哪些失效形式?常用的设计准则主要有哪些?
【单选题】It won’t work:,it’s a bad idea,and secondly it’ll cost too much.
A.
above all
B.
to begin with
C.
first of all
D.
at first
【单选题】已知 RC ≡ CH + NaNH 2 ── > RC ≡ CNa + NH 3 , 炔钠加水又能恢复成炔烃 RC ≡ CNa + H 2 O ── > RC ≡ CH + NaOH, 据此可 推测酸性大小为 :
A.
(A) NH 3 >RC ≡ CH>H 2 O
B.
(B) H 2 O>RC ≡ CH>NH 3
C.
(C) H 2 O>NH 3 >RC ≡ CH
D.
(D) HN 3 >H 2 O>RC ≡ CH
【单选题】Don’t forget it’ll be the first time ____ in public
A.
I’ve spoken
B.
I shall speak
C.
I will speak
D.
I speak
【单选题】—It's _____ in the sea, I feel very nervous. —Don't worry, you'll _____ it soon. [ ]
A.
the first time swim, get used to do
B.
my first time swimming, used to
C.
my first time swimming, become used to
【单选题】有以下表单,能正确接收上传的文件的是()
A.
$_POST['pic']
B.
$_GET['pic']
C.
$_FILES['pic']
D.
$_FILE['pic']
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