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【单选题】
下列哪诊断心动过缓的脉搏次数A.
<；40次/分
B.
<；50次/分
C.
<；60次/分
D.
<；70次/分
E.
<；80次/分
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举一反三
【单选题】在间歇反应器中等温进行一级不可逆反应 A→R ,当转化率达 90 %时,所需反应时间为 2h ,若反应改在管式反应器中进行,空时为 2h ,其它条件同间歇反应器,则转化率为
A.
60％
B.
90％
C.
45％
D.
75％
【单选题】Why couldn't Karl promise anything?
A.
He didn't want to lend Larry a hand.
B.
Larry's case was too serious.
C.
Larry would be found guilty for sure.
D.
The other members of the jury might not listen to his recommendation.
【单选题】Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.
A.
would lock
B.
was locking
C.
has locked
D.
had locked
【单选题】At first, his teacher couldn’t’ realize that Lang Lang had a ________ for music though he said he wanted to learn the piano so much.
A.
knowledge
B.
present
C.
gift
D.
desire
【单选题】在间歇反应器中等温进行一级不可逆反应A→R，当转化率达90％时，所需反应时间为2h若反应改在管式反应器中进行，空时为2h，其它条件同间歇反应器，则转化率为（）。
A.
60％
B.
90％
C.
45％
【单选题】The traffic was making so much noise that I couldn’t hear what he________ .
A.
is saying
B.
was saying
C.
has said
D.
will say
【单选题】关于等电聚焦电泳，下列叙述哪个是错误的
A.
是目前电泳技术中分辨率较好的方法之一
B.
特别适用于分子量不同而电荷相同的蛋白质的分离
C.
利用具有线性pH梯度的电泳介质来分离物质
D.
适用于分子量相同而电荷不同蛋白质或多肽的分离
E.
等电聚焦电泳还可以用于酶学研究
【单选题】在反应体积 1m 3 间歇反应器中等温进行一级不可逆反应 A → R ,当转化率达 90 %时,所需反应时间为 2h ,若反应条件不变,反应体积改为2 m 3, 则 2h时 转化率为( )
A.
60%
B.
90%
C.
45%
D.
75%
【单选题】一 Where have you been all day? — I _____ some former classmates and I couldn't get back until it was dark. [ ]
A.
have met
B.
met
C.
would meet
D.
had met
【单选题】________ enough time, but he couldn’t do it better.
A.
He was given
B.
Given
C.
To be given
D.
Though he was given
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