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【单选题】
职业病危害因素按来源可分为生产过程、劳动过程和生产环境中产生的有害因素三类。生产过程中产生的职业病危害因素，按其性质可分为（ ）。A.
接触因素、辐射因素、传染因素
B.
物理因素、化学因素、生物因素
C.
物理因素、化学因素、有毒因素
D.
浓度因素、强度因素、生物因素
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举一反三
【单选题】China __________ the WTO and became a new member of it.
A.
joined
B.
join
C.
will join
D.
has joined
【单选题】China the WTO and became a new member of it last year .
A.
joined
B.
join h
C.
will join
D.
as joined
【单选题】China _____ the WTO and became new member of it last year. [ ]
A.
joins
B.
joined
C.
will join
D.
has joined
【简答题】构建健康生命包所遵循的原理有 APSH原理 B比较文化的基础 C个体差异:年龄、财富等 D动态平衡
【单选题】Do you still remember the year _________ China became a member of WTO?
A.
that
B.
which
C.
when
D.
what
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