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【单选题】
测定水中化学需氧量时加入硫酸汞的作用是( )。A.
防止生成沉淀
B.
络合水中的氯离子，消除其干扰
C.
控制水中的pH
D.
抑制苯酚菌的分解活动
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举一反三
【单选题】听力原文： Do you know the most unusual building of the nineteenth century? Perhaps it was the Crystal Palace. It was built in Hyde Park for the Great Exhibition of 1851. The Crystal Palace was different f...
A.
The steam boat.
B.
The steam engine.
C.
The steam hammer.
【单选题】企业通信发展经历了传统通信、融合通信、统一通信和智能通信四个阶段，以下不属于智能通信特点的是（）
A.
智能通信的实质就是统一通信技术与业务运作流程的结合，实现企业内部业务运作流程的智能化和自动化
B.
智能通信的核心是开放架构的通信平台
C.
通信系统向各异构业务系统开放各种标准化接口，实现通信资源和通信能力的开放，实现各种信息媒介流之间的自动转换，实现信息流在各业务系统间的智能流动和呈现
D.
用户不受所处地点、时间、所使用终端类型、运营商商网络条件、信息媒介类型等等条件限制，都可以实现实时和有效的沟通，实现文字、图像等各种媒介信息流的高效流动
【单选题】It was t ypical ______ mother to say that , but it was important ______ me to work harder .
A.
of ; of
B.
for ; for
C.
for ; of
D.
of ; for
【单选题】Mr. Mike doesn’t understand ________ made his wife so upset this morning.
A.
what was it
B.
why it was that
C.
how that was
D.
what it was that
【单选题】Mike didn’t understand _______ made his wife so upset this morning.
A.
what was it that
B.
what it was that
C.
how that was
D.
why it was that
【单选题】To say that his wife was a “ magnificent parade’( paragraph Two) implies that it was to some extent.
A.
.spent chiefly at war.
B.
impressive and admirable.
C.
lived too pompously D. an empty show.
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