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【判断题】
DG270-150型水泵。DG表示电动锅炉给水泵,270表示270m3/h,150表示出口压力为150MPa。()
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】This is the first time he __________ the most book. [     ]
A.
read
B.
 reads
C.
had read
D.
has read
【单选题】I would rather you ______ there.
A.
walking     
B.
to walk     
C.
walk     
D.
walked
【单选题】When you walk in a busy street, you should walk on the side ______.
A.
where the wind is coming
B.
where the wind is going
C.
where the wind is weaker
D.
where the wind is stronger
【简答题】设 , ,求 (1) 在 处增加最快的方向以及 沿这个方向的方向导数; (2) 在 处减少最快的方向以及 沿这个方向的方向导数; (3) 在 处的变化率为零的方向.
【简答题】You have to ______ if you want to go on the Ghost Walk.
【单选题】---Will you walk a little faster? ---I was afraid you could not _____ .
A.
walk up
B.
go up
C.
keep up
D.
catch up
【简答题】You walk on it in a room.
【简答题】You can walk on it.
【多选题】为他人作介绍时必须遵守“尊者优先知情”规则。以下介绍正确的有( )。
A.
把职务低者介绍给职务高者
B.
把同事、朋友介绍给家人
C.
聚会上把后到者介绍给先到者
D.
把已婚者介绍给未婚者
【单选题】The tip 'know when to walk away' tells us that ______.
A.
you should walk away when you see something you like but expensive
B.
sometimes appropriate detached attitudes can ensure you a bargain
C.
don't act too shy to leave
D.
you'd better walk away when you have a second chance
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