皮皮学,免费搜题
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搜题
【判断题】
二极管不能工作在反向击穿区;而稳压管工作区域是反向击穿区
A.
正确
B.
错误
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举一反三
【判断题】The platform is one example of packaging component
A.
正确
B.
错误
【单选题】The platform is ______________ the left side of the train.
A.
by
B.
in
C.
of
D.
on
【简答题】The platform is wet and slippery. Please walk slowiy.
【单选题】Wearing a harness with a lanyard attached to the platform can provide extra protection against falls,especially while the platform is in motion.
A.
safety belt
B.
protective clothing
C.
hard hat
D.
safety gloves
【单选题】-Why didn't you lock the door before you left? -I_____, but I forgot.
A.
should
B.
must have
C.
should have
D.
could have
【判断题】十二指肠全部,均属于腹膜外位器官。 ( )
A.
正确
B.
错误
【单选题】普通水泥的代号是( )
A.
P.I
B.
P.O
C.
P.P
D.
PF
【单选题】普通水泥的代号是 ( )
A.
P · I
B.
P · II
C.
P · O
D.
P ·
【简答题】普通水泥的代号是( )
【单选题】普通水泥的代号是()。
A.
P²S
B.
P²C
C.
P²O
D.
P²Ⅱ