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【单选题】
关于施工质量控制特点的说法，正确的是( )。A.
施工质量受到多种因素影响，因此要保证质量合格很难完全做到
B.
施工生产不能进行标准化施工，因此各个工程质量有差异是难免的
C.
施工质量主要依靠对工程实体的终检来判断是否合格
D.
施工质量控制中，必须强调过程控制，及时做好检查、签证记录
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【单选题】硒（Se）是人体中的微量元素，有防癌抗癌作用．饮用含适量硒的矿泉水有益于人体健康．有一种硒的氧化物，化学式为SeO 3 ，其中Se的化合价为（ ）
A.
+3
B.
-3
C.
+6
D.
-6
【简答题】甘草中具有抗炎、镇咳、抗癌作用的成分是
【单选题】Which of the following modulations is for the VHF radio telephone?
A.
G3E
B.
F3E
C.
G2B
D.
F1B
【单选题】Which of the following facts from the selection best supports the statement that the radioactive waste is an unsolved problem?
A.
We have already generated over 10,000 tons of nuclear waste.
B.
Radioactivity could be released into the environmental from activities related to mining and processing nuclear fuel.
C.
Only a part of nuclear fuel is fissionable.
D.
A location for stainless steel tanks containing 'high-level liquid waste' mixed with molten glass has not been found.
【单选题】Once ARQ communication with the coast radio station has been establ/shed, which of the following exchanges will most likely take place?
A.
The vessel then requests the coast radio station's selcall so that communication can be set up on the appropriate working channel. ’
B.
Since communication has akeady shifted to the working channel, the vessel then transmits the subscriber number and text of the message to be sent for the coast radio station to store and forward.
C.
After exchanging answerbacks with the vessel, the coast radio station transmits.c GA+"．
D.
After exchanging answerbacks with the coast radio station, the vessel transmits“GA+”．
【简答题】简答中心性发绀和周围性发绀的鉴别要点
【单选题】Which of the following characteristics of radio galaxies is mentioned in the passage?
A.
They are a type of elliptical galaxy.
B.
They are usually too small to be seen with a telescope.
C.
They are closely related to irregular galaxies.
D.
They are not as bright as spiral galaxies.
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