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【多选题】
关于变压器的作用，下列说法正确的是( )。A.
在电力系统中，作为测量、控制、指示、继电保护等电路的信号源
B.
使仪表、继电器等与高电压、大电流的被测电路绝缘
C.
使仪表、继电器的规格比直接测量高电压、大电流时所用仪表、继电器的规格小得多
D.
可以使仪表、继电器的规格统一，以便于制造且可减小备用容量
E.
主要用于变电所内仪器、设备的用电
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举一反三
【单选题】As an engineer, you can't be careful. You should pay attention to every detail.
A.
very
B.
too
C.
so
D.
quite
【单选题】Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A.
being exposed
B.
to expose
C.
exposing
D.
exposed
【判断题】The UN says the world must do much more to reduce the number of overweight children.
A.
正确
B.
错误
【单选题】The UN must do something before the war _______beyond control.
A.
escalated into
B.
escalated
【单选题】The UN must do something before the war _______ beyond control.
A.
escalated
B.
appoved
C.
represented
D.
justified
【单选题】Be careful when you watch the painting as it is______.
A.
valueless
B.
priceless
C.
costless
D.
worthless
【单选题】The 'Minamata Bay' example in the first paragraph proved that ______.
A.
if mankind do something harmful to the environment, vice versa, the indeed victims are themselves
B.
a local industry which had released mercury into Minamata Bay was the real murderer
C.
how this highly toxic element stored up in the bodies of local fish and ually harmful to the bodies of people who consumed the fish
D.
the theory of pollution
【单选题】Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
A.
exposed
B.
to expose
C.
exposing
D.
being exposed
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