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【单选题】
关于洁净室空气的净化的叙述错误的是:A.
空气净化的方法多采用空气滤过法
B.
以0.5μm和5μm作为划分洁净度等级的标准粒径
C.
空气滤过器分为、中效、高效三类
D.
高效滤过器一般装在通风系统的首端
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【单选题】No one is island. We share the world with parents, friends, teachers and classmates. Most of the time, we get on well with each other. But sometimes we disagree as well.
A.
the
B.
an
C.
a
【简答题】Some students even have no idea of they are studying, so they are aimless most of the time. A．whoBSome students even have no idea of____they are studying, so they are aimless most of the time. A．who...
【单选题】下列哪个描述是正确的?
A.
程序中的每一行都必须以分号结束。
B.
程序中的每个语句都必须以分号结束。
C.
每个注释行必须以分号结束。
D.
每个方法都必须以分号结束。
【单选题】Most of the time ,no one will care about natural disasters, and they won ’ t avoiding disasters till one has really struck.
A.
be serious about
B.
be attracted to
C.
feel obliged to
D.
looked upon as
【单选题】Some students even have no idea of they are studying, so they are aimless most of the time.
A.
who
B.
when
C.
where
D.
why
【简答题】Most of the time, no one will care about natural disasters, and they won’t avoiding disasters till one has really struck.
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