【单选题】【消耗次数：1】
以下哪种情形需要选用携气式空气呼吸器
①
氧百分比浓度22%
②
达到国家职业卫生标准规定浓度（OELs）
③
未达到国家职业卫生标准规定浓度（OELs）
④
未达到IDLH浓度
⑤
达到IDLH浓度
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相关题目
【多选题】
工作场所职业病危害因素浓度或强度达不到国家职业卫生标准或卫生要求，首先应该采取治理措施，包括（）,仍然不达标，停止职业病危害作业。
①
替代
②
消除
③
工程措施
④
管理措施
【单选题】
以下哪种情形可以选用过滤式呼吸防护器
①
未知化学毒物
②
未知毒物浓度
③
达到国家职业卫生标准规定浓度（OELs）
④
达到IDLH浓度
⑤
氧百分比浓度低于18%
【单选题】
以下哪种情形不属于立即威胁生命和健康（IDLH）环境
①
氧百分比浓度低于18%
②
现场有人死亡
③
现场大量毒物泄露，怀疑有人死亡
④
现场大量毒物泄露，怀疑有动物死亡
⑤
达到国家职业卫生标准规定浓度（OELs）
随机题目
【单选题】
You ____ business interfering with my affairs.
①
have none
②
have no
③
have none of the
④
have nothing like
【单选题】
We looked for a table to sit down, but they were all ____.
①
reserved for
②
engaged in
③
used up
④
taken up
【单选题】
It is ____ with the customer not to let the shop
assistants guess what she really likes and wants until
the last moment.
①
in her honor
②
on her honor
③
a point of honor
④
an honor
【单选题】
But the Swiss discovered long years ago that
constant warfare brought them ____suffering and
poverty.
①
anything but
②
nothing but
③
none other than
④
no more than
【单选题】
Information and opinion gap exercises have to have
some content ___ talking about.
①
worthwhile
②
worthily
③
worth
④
worthy
【单选题】
Jane tried to ____ the doorman with money, but she
failed.
①
bribe
②
corrupt
③
award
④
endow
【单选题】
He packed an ____ shirt in case he had to stay another day.
①
spare
②
unnecessary
③
excessive
④
extra
【单选题】
I was awfully tired when I got home from work, but a
half hour nap ____ me.
①
revived
②
released
③
relieved
④
recovered
【单选题】
An institution that properly carries the name university is a more comprehensive and complex institution than any other kind of higher education ____.
①
settlement
②
establishment
③
construction
④
structure