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【简答题】
速度继电器是当转速达到规定值时触头动作的继电器。主要用于电动机反接制动控制电路中,必须当反接制动的转速绝对下降到时___能自动地及时切断电源。
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举一反三
【单选题】What is NOT true about the Leaning Tower?
A.
It makes its city Pisa well-known.
B.
Its construction took nearly 200 years.
C.
Many measures have been taken to correct the lean.
D.
If you go to Pisa now, you can go and visit the Leaning Tower.
【单选题】What did protesters do when the police blocked the bridge in Selma?
A.
fought against them
B.
knelt down in prayer
C.
sang songs
D.
screamed at them
【单选题】下列表述不正确的是
A.
呕血时应排除口腔、鼻咽部出血或咯血
B.
判断黑粪时，应排除因食用过多肉类、动物肝脏、动物血以及服用铁剂、铋剂、炭粉等所致的黑粪
C.
粪便隐血实验阳性者提示:每天出血量大于5ml
D.
黑粪提示每日出血量在50～70ml以上
E.
呕血提示胃内潴留血量达200-250ml以上
【单选题】下列表述不正确的是: ( )
A.
呕血时应排除口腔、鼻咽部出血或咯血
B.
判断黑粪时，应排除因食用过多肉类、动物肝脏、动物血以及服用铁剂、铋剂、炭粉等所致的黑粪
C.
粪便隐血实验阳性者提示:每天出血量大于5ml
D.
呕血达250～300ml以上
【单选题】What blocked construction of new roads in 1940s?
A.
Lack of technology
B.
Lack of money
C.
Neighborhoods
D.
Time pressure
【单选题】What is meant by the term two-blocked（）.
A.
The bottom block touches the top block
B.
The line has jumped the sheaves
C.
There are turns in the fall
D.
You have two blocks
【简答题】在大量易燃易爆气体泄漏的场所，一般情况下，下面( )种动作容易引起静电。
【单选题】What did the education minister say would be blocked for six days?
A.
school gates
B.
Facebook
C.
Twitter
D.
roads
【单选题】下列表述不正确的是
A.
呕血时应排除口腔、鼻咽部出血或咯血
B.
判断黑粪时,应排除因食用过多肉类、动物肝脏、动物血以及服用铁剂、铋剂、炭粉等所致的黑粪
C.
粪便隐血实验阳性者提示:每天出血量大于5ml
D.
黑粪提示出血量在50~70ml以上
E.
呕血达250~300ml以上
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