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【单选题】
下列关于微孔滤膜的叙述不正确的是( )。A.
微孔总面积占薄膜总面积的80%，孔径大小均匀
B.
无菌过滤应采用0.3μm或0.22μm的滤膜
C.
微孔滤膜不影响药液的pH值
D.
微孔滤膜滤速要比其他过滤介质快
E.
滤膜一般用于注射液的粗滤
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举一反三
【单选题】数据流图是用于表示软件模型的一种图示方法，在下列可采用的绘制方法中，( )是常采用的。 ①自顶向下 ②自底向上 ③分层绘制 ④初步求精
A.
全是
B.
①③和④
C.
②③和④
D.
①和③
【单选题】数据流图是用于表示软件模型的一种图示方法，在下列可采用的绘图方法中，( )是常采用的。 ①自顶向下 ②自底向上 ③分层绘制 ④逐步求精
A.
全是
B.
①③④
C.
②③④
D.
①④
【单选题】— Excuse me, can you spare me a few minutes? —Sorry, I haven’t ______ time to talk to you just now. I have to leave early to catch ______ 4:30 train.
A.
/; /
B.
the; the
C.
a; the
D.
the; /
【单选题】Speaker A: Excuse me， Professor Smith， can you spare me a few minutes? There‘ s something I‘ d like to speak to you about. I won‘ t keep you long. Speaker B :__________
A.
Of course not. Haven' t you seen have been pretty busy now?
B.
Well， I' m afraid we have to find some other time. I' m fully occupied now.
C.
No. I' 11 have an important meeting to attend this evening.
D.
Not possible， as I don' t know how long you will keep me.
【单选题】--- Can you spare me some paper? --- Sorry, mine ______.
A.
is run out
B.
has used up
C.
has been used
D.
has urn out
【单选题】Speaker A: Excuse me, Professor Smith, can you spare me a few minutes? There's something I'd like to speak to you about. I won't keep you long. Speaker B:_________
A.
Of course not. Haven't you seen have been pretty busy now?
B.
Well, I'm afraid we have to find some other time. I'm fully occupied now.
C.
No. I'll have an important meeting to attend this evening.
D.
Not possible, as I don't know how long you will keep me.
【单选题】数据流图是用于表示软件模型的一种图示方法，在下列可采用的绘制方法中，( )是常采用的。 Ⅰ.自顶向下 Ⅱ.自底向上 Ⅲ.分层绘制 Ⅳ.逐步求精
A.
Ⅰ和Ⅲ
B.
Ⅰ、Ⅲ和Ⅳ
C.
Ⅱ、Ⅲ和Ⅳ
D.
全部
【单选题】数据流图是用于表示软件模型的一种图示方法，在下列可采用的绘制方法中，常采用的方法是 Ⅰ．自顶向下 Ⅱ．自底向上 Ⅲ．分层绘制 Ⅳ．逐步求精
A.
Ⅰ、Ⅲ和Ⅳ
B.
Ⅱ、Ⅲ和Ⅳ
C.
Ⅰ、Ⅱ和Ⅲ
D.
Ⅰ、Ⅱ和Ⅳ
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