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【单选题】
关于职业性铅中毒下列说法错误的是( )A.
铅的吸收甚缓，主要经消化道及呼吸道吸收。
B.
治疗铅中毒的首选药物是依地酸二钠钙
C.
吸收后绝大部分沉积于骨中，沉积骨中的铅盐并不危害身体。
D.
骨骼为铅的靶器官
E.
铅线是由齿龈及颊粘膜上由于硫化铅的沉着而形成
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【单选题】There is _____ like the taste of a glass of cold milk-it has been described as the perfect food by westerners. [ ]
A.
something
B.
anything
C.
nothing
D.
everything
【单选题】听力原文：W: What's all this glass doing on the floor? M: Look at the window and you'll see. The kids were playing basketball and Tommy failed to catch it. Q: What do we learn from the conversation? (3)
A.
Tommy fell to the ground and broke his glasses.
B.
The window was broken by the kids.
C.
The kids were playing with the glasses.
D.
Tommy failed in the basketball game.
【单选题】下列的市场类型中,对厂商数目的排序正确的是( )
A.
完全竞争>寡头垄断>垄断竞争
B.
垄断竞争>寡头垄断>完全垄断
C.
寡头垄断>垄断竞争>完全竞争
D.
完全垄断>寡头垄断>完全竞争
【简答题】生命的基本特征是 、 、 、和 。
【简答题】SQL
Server 2016 是一个( )的数据库系统。 A:网状型;B:层次型;C:关系型;D:以上都不是;A. 网状型 B. 关系型 C. 层次性 D. 非关系型
【单选题】During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
A.
the highest
B.
above 3/4
C.
1/2 -3/4
D.
the lowest
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